2022 г.

В списания с импакт фактор / 2022:

1. Daskalova A, Filipov E, Angelova L, Stefanov R, Tatchev D, Avdeev G, Sotelo L, Christiansen S, Sarau G, Leuchs G, Iordanova E, Buchvarov I., Ultra-Short Laser Surface Properties Optimization of Biocompatibility Characteristics of 3D Poly-ε-Caprolactone and Hydroxyapatite Composite Scaffolds, Materials. 2021; 14(24):7513, DOI:https://doi.org/10.3390/ma14247513, SJR:0.68, IF=3.623, Q2 . линк:

2. L. Angelova, A. Daskalova, E. Filipov, X.M. Vila, J. Tomasch, G. Avdeev, A.H. Teuschl-Woller, I. Buchvarov, Optimizing the Surface Structural and Morphological Properties of Silk Thin Films via Ultra-Short Laser Texturing for Creation of Muscle Cell Matrix Model, Polymers, 14, 13, MDPI, 2022, 2584, SJR:0.73, JCR-IF:4.329, Q1 DOI:https://doi.org/10.3390/polym14132584 линк:

3. O. V. Kalinkevich, H. Ye. Polozhii, S. V. Kolinko, Ye. I. Zinchenko, A. Yu. Karpenko, V. A. Baturin, A. G. Ponomarev, A. N. Kalinkevich, S. N. Danilchenko, A. Daskalova, L. Angelova, I. Buchvarov, Controllable structures on the surface of natural polymers made by proton beam writing and femtosecond laser treatment | Створення контрольованих мікроструктур на поверхні природних полімерів за допомогою протонної літографії та фемтосекундного лазера, Fizika Nizkikh Temperatur, 4, 48, 2022, 393-397. SJR (Scopus):0.16, JCR-IF:0.89, Q4.

4. Еmil Filipov, Liliya Angelova, Sanjana Vig, Maria Helena Fernandes, Gerard Moreau, Marie Lasgorceix, Ivan Buchvarov, Albena Daskalova, Investigating Potential Effects of Ultra-Short Laser-Textured Porous Poly-ε-Caprolactone Scaffolds on Bacterial Adhesion and Bone Cell Metabolism, Polymers, 14, 12, MDPI, 2022, DOI:https://doi.org/10.3390/polym14122382, 2382. SJR:0.73, JCR-IF:4.329, Q1, DOI:https://doi.org/10.3390/ma15134670 линк 1: линк 2:

5. Dante M. Aceti, Emil Filipov, Liliya Angelova, Lamborghini Sotelo, Tommaso Fontanot, Peyman Yousefi, Silke Christiansen, Gerd Leuchs, Stanislav Stanimirov, Anton Trifonov, Ivan Buchvarov, Albena Daskalova, Single-Step Process For Titanium Surface Micro and Nano Structuring and In Situ Silver Nanoparticles Formation by Ultrashort Laser Patterning, Materials, MDPI, 2022, 15(13), 4670, JCR-IF:3.263, Q2.

6. L. Angelova, A. Daskalova, E. Filipov, R. Mincheva, X. Carette, D. Miano, D. Aceti, A. Trifonov, I. Buchvarov, Analysis of Chitosan/ Hydroxyapatite spin-coated fs microstructured Poly Lactic Acid (PLA) temporary cell scaffolds, Optical and Quantum Electronics 54, 721 (2022). SJR:0.4, IF=2.084, Q2. линк:

7. L.M. Kovachev, Radiation forces and confinement of neutral particles into the pulse envelope. New regime of collision ionization, Optik, 269, 169943 (2022), ISSN 0030-4026, IF: 2.84 (Q2). линк:

8. E. Iordanova, G. Yankov, S. Karatodorov, L. Kovachev, "Diffraction-free femtosecond optics," Optik, 267, 169681 (2022), ISSN 0030-4026, IF: 2.84 (Q2). линк:

9. Aneliya Dakova, Yaldaz Murad, Zara Kasapeteva, Diana Dakova, Valeri Slavchev, Lubomir Kovachev, Anjan Biswas, Cnoidal waves and dark solitons with linear third-order dispersion and self-steepening effect, Optik - International Journal for Light and Electron Optics, 270, (2022), 170035, ISSN 0030-4026, IF: 2.84 (Q2). линк:

10. Zara Kasapeteva, Aneliya Dakova, Stefka Krasteva, Valeri Slavchev, Diana Dakova, Lubomir Kovachev, Anjan Biswas, Bright solitons under the influence of third-order dispersion and self-steepening effect, Opt Quant Electron 54, 352 (2022), Electronic ISSN 1572-817X, Print ISSN 0306-8919, IF: 2.084 (Q2). линк:

11. Valeri Slavchev, Ivan Bozhikoliev, Zhelyazko Zamanchev, Aneliya Dakova, Kamen Kovachev, Anjan Biswas, Optical vortices in waveguides with spatial dependence of the nonlinear refractive index, Opt Quant Electron 54, 346 (2022), Electronic ISSN 1572-817X, Print ISSN 0306-8919, IF: 2.084 (Q2). линк:

12. Elsayed M. E. Zayed, Reham M. A. Shohib, Mohamed E. M. Alngar, Anjan Biswas, Yakup Yildirim, Anelia Dakova, Hashim M. Alshehri and Milivoj R. Belic, Optical solitons with Sasa-Satsuma model having multiplicative noise via Itô calculus, Ukrainian Journal of Physical Optics, Volume 23, Issue 1, 9-14, (2022) ISSN 1816-2002 (Online), ISSN 1609-1833 (Print), IF: 0.783 (Q3).

13. Abdullahi Rashid Adem, Basetsana Pauline Ntsime, Anjan Biswas, Anelia Dakova, Mehmet Ekici, Yakup Yildirim, Hashim M. Alshehri, Stationary optical solitons with Kudryashov's self-phase modulation and nonlinear chromatic dispersion, Optoelectronics and Advanced Materials - Rapid Communications, Vol. 16, No. 1-2, January-February 2022, p. 58 - 60, Print: ISSN 1842-6573, On-line: ISSN 2065-3824 IF: 0.441 (Q3).

14. I. P. Christov, Effects of Spatial Nonlocality versus Nonlocal Causality for Bound Electrons in External Fields, Entropy 24, 840 (2022); IF 2.52, (Q2).

В списания с импакт ранг / 2022:

1. L. Angelova, A. Daskalova, R. Mincheva, X. Carette, A. Trifonov, E. Filipov, D.M. Aceti, I. Buchvarov, Ultra-fast laser modification of Poly Lactic Acid (PLA) - towards enhanced biocompatibility, Journal of Physics: Conference Series, 2240, 012042, 2022, DOI:10.1088/1742-6596/2240/1/012042, SJR (Scopus):0.21, Q4 .

2. E. Filipov, L. Angelova, D.M. Aceti, A. Daskalova, V.Marinova, D. Karashanova, A. Trifonov, I.Buchvarov, Altering the surface morphology and wettability of chitosan/graphene coatings by femtosecond and nanosecond laser processing, Journal of Physics: Conference Series, 2240, 012041, 2022, DOI:10.1088/1742-6596/2240/1/012041, SJR (Scopus):0.21, Q4.

3. D.M. Aceti, A. Daskalova, L. Angelova, E. Filipov, A. Andreeva, A. Trifonov, I. Buchvarov, Optimization of titanium and titanium alloy surface properties by ultra-short laser pulse processing for improved antibacterial behavior, Journal of Physics: Conference Series, 2240, 012040, 2022, DOI:10.1088/1742-6596/2240/1/012040, SJR (Scopus):0.21, Q4.

4. N Nedyalkov, T Dilova, A Dikovska, Ru Nikov, Ro Nikov, M Koleva, N Stankova, Al Daskalova, L Angelova, Laser processing of nitride ceramics, Journal of Physics: Conference Series, 2240, 012044, IOP Publishing, 2022, DOI:10.1088/1742-6596/2240/1/012044, SJR (Scopus):0.21, Q4.

5. O. V. Kalinkevich, H. Ye. Polozhii, S. V. Kolinko, Ye. I. Zinchenko, A. Yu. Karpenko, V. A. Baturin, A. G. Ponomarev, A. N. Kalinkevich, S. N. Danilchenko, A. Daskalova, L. Angelova, I. Buchvarov, Controllable structures on the surface of natural polymers made by proton beam writing and femtosecond laser treatment, Low Temperature Physics, 48, 4, AIP Publishing, 2022, ISSN:0132-6414 (Print) 1816-0328 (On-line), DOI:https://doi.org/10.1063/10.0009742, 393-397. SJR (Scopus):0.36, Q3. линк:

6. Valeri Slavchev, Diana Dakova, Aneliya Dakova, Zara Kasapeteva and Lubomir Kovachev, Method for solving vector nonlinear differential equations with application in waveguide optics, AIP Conference Proceedings 2505, 030012 (2022); ISSN 0094243X, 15517616, SJR: 0.19. линк:

7. Aneliya Dakova, Diana Dakova, Zara Kasapeteva, Anjan Biswas, Valeri Slavchev and Lubomir Kovachev, Method for solving systems of differential equations with application in nonlinear optics, AIP Conference Proceedings 2505, 030001 (2022); ISSN 0094243X, 15517616 SJR: 0.19. линк:

8. V. Slavchev, A. Dakova, N. Gocheva, I. Bozhikoliev, K. Kovachev, A. Biswas, Laser ring structures in step-index fibers, Journal of Physics: Conference Series, Volume 2339, International Conference on Electronics, Engineering Physics and Earth Science 2022 (EEPES 2022), SJR: 0.23 (Q4), Online ISSN: 1742-6596, Print ISSN: 1742-6588. линк:

В други реферирани издания, които са индексирани в световни литературни източници, без импакт фактор и ранг / 2022:

1. Albena Daskalova, Liliya Angelova, Ultra-short laser patterning of silk fibroin thin films – a potential scaffold platform in tissue engineering applications, Industry 4.0, 7, 1, SCIENTIFIC TECHNICAL UNION OF MECHANICAL ENGINEERING INDUSTRY-4.0, 2022, ISSN:2535-0021 (PRINT) 2535-003X (ONLINE), 128-131

2. O. V. Kalinkevich, H. Ye. Polozhii, S. V. Kolinko, Ye. I. Zinchenko, A. Yu. Karpenko, V. A. Baturin, A. G. Ponomarev, A. N. Kalinkevich, S. N. Danilchenko, A. Daskalova, L. Angelova, I. Buchvarov, Controllable structures on the surface of natural polymers made by proton beam writing and femtosecond laser treatment, Физика Низких Температур 48, 4, 2022, ISSN:0132-6414 (Print) 1816-0328 (On-line), 393-397.

3. Ivanov L.M. Cholakov T., "Optical quartz fibers as non-linear media and four-wave mixing method for determination of fibers geometrical parameters", Bulgarian Chemical Communications, Volume 54, Special Issue B2 (pp. 73-77) 2022 DOI: 10.34049/bcc.54.B2.0375,Revised: August 02, 2022 , SJR 0.14.

2015 г.

1. Daniela A Georgieva and Lubomir M Kovachev, Energy transfer between two filaments and degenerate four-photon parametric processes Laser Physics, 25, 035402 (7pp) (2015). doi:10.1088/1054-660X/25/3/035402.IF-1.025 (2013).

2. L M Kovachev, D A Georgieva and A. M. Dakova, Influence of the four-photon parametric processes and cross-phase modulation on the relative motion of optical filaments Laser Phys. 25 (2015) 105402 (7pp), doi:10.1088/1054-660X/25/10/105402

3. A. M. Dakova, L. M. Kovachev, K. L. Kovachev, D. Y. Dakova, Fraunhofer type diffraction of phase-modulated broad-band femtosecond pulses, Journal of Physics: Conference Series 594. 012023 (2015), doi: 10.1088/1742-6596/594/1/012023.

4. V. Slavchev, L. Kovachev, L.M. Ivanov, Optimization of the nonlinear regime of self-compression at femtosecond laser pulses in silica and air, Journal of Physics: Conference Series 594, 012038 (2015), doi: 10.1088/17426596/594/1/012038.

5. A. Dakova, D. Dakova, L.M. Kovachev, Comparison of soliton solutions of the nonlinear Schrodinger equation and the nonlinear amplitude equation, Proc. of SPIE, V 9447, doi.org/101117/12.2177906.

6. D. A Georgieva, Lubomir M. Kovachev, Merging and energy exchange between optical filaments, AIP Conference proceedings, V 1684, pp 080005. линк:

КОНФЕРЕНЦИИ / 2015:

NEEDS-2015: Nonlinear Evolution Equations and Dynamical Systems, Masrgherita di Pula, Sardinia, Italy, 24.06.2015 - 01.07.2015 Kovachev L.M., Localized Solutions of the Linear and Nonlinear Wave Equations.

2014 г.

1. L. M. Kovachev, 2014, The light filament as vector solitary wave, AIP Conference Proceedings 1629, 167; doi: 10.1063/1.4902271.

2. D. A. Georgieva and L. M. Kovachev, Four-photon parametric mixing and interaction between filaments AIP Conference Proceedings 1629, 146 (2014); doi: 10.1063/1.4902268

3. D. Georgieva and L. Koachev, Energy transfer between two filaments and degenerate four - photon parametric processes Laser Physics, accepted

4. V. Slavchev, L. Kovachev, L. M. Ivanov, Optimization of the nonlinear regime of self-compression of femtosecond pulses in silica and air submitted in Open Access Journal of Physics: Conference Series (JPCS), accepted

5. A. Dakova, L. M. Kovachev, K. L. Kovachev, D. Dakova, λ(3) diffraction of phase modulated broad band laser pulses submitted in Open Access Journal of Physics: Conference Series (JPCS), accepted.

6. A. Dakova, D. Dakova, L. Kovachev, Comparison of soliton solutions of the nonlinear Schrodinger equation and the nonlinear amplitude equation 18 SPIE, accepted.

2013 г.

1. Kovachev L M, Georgieva D A and Serkin V N 2013, Parametric solitons in isotropic media AIP Conf. Proc. 1561 289

2. Dakova A M and Dakova D I 2013, Nonlinear regime of propagation of femtosecond optical pulses in a single-mode fiber Proc. SPIE 8770 87701J

3. Kovachev L M and Georgieva D A 2013, The long range filament stability: balance between non-paraxial diffraction and third-order nonlinearity Proc. SPIE 8770 87701G

4. Ivanov L M and Kovachev L M 2013, Improved four photon mixing methods for optical fibre's parameters control Proc. 5-th Int. Sci. Conf. FMNS 2013 3 pp 57-64.

5. Kovachev L M, Ivanov L M and Kovachev K L 2013, Broad-band laser pulses. Linear and nonlinear regime Proc. Second Nat. Congress Phys. Sci. (Sept 2011 Sofia Bulgaria) pp 224- 225.

6. Dakova A and Dakova D 2013, Propagation of broad-band pulses in nonlinear dispersive media Proc. Second Nat. Congress Phys. Sci. (Sept 2011 Sofia Bulgaria) p 226.

7. Slavchev and Kovachev L 2013, Nonlinear regime of propagation of optical pulses phase-modulated by a double-convex lens Proc. Second Nat. Congress Phys. Sci. (Sept 2011 Sofia Bulgaria) p 230.

8. Kovachev L 2013, Shock wave in Euler-Heisenberg-Kockel nonlinear vacuum Proc. Second Nat. Congress Phys. Sci. (Sept 2011 Sofia Bulgaria) pp 453-4.

2012 г.

1. Kovachev L M, Georgieva D A and Kovachev K L 2012, Electromagnetic shock wave in nonlinear vacuum: exact solution Opt. Lett. 37 4047-9 DOI: 10.1364/ OL.37. 004047

2. Kovachev L M and Georgieva D A 2012, A class of localized solutions of the linear and nonlinear wave equation J. Geometry and Symmetry in Physics 27 67-82 ISSN: 1312-5192.

3. Kovachev L M and Georgieva D A 2012, Analytical solution of the linear wave equation with finite energy AIP Conf. Proc. 1487 264 DOI: 10.1063/1.4758967.

2011 г.

1. Kovachev L M and Kovachev K 2011, Linear and nonlinear femtosecond optics in isotropic media Laser System for Applications (InTech. Rijeka) 3/11 209-27 ISBN 978-953-307-429-0.

2. Belyaeva T L, Serkin V V, Aquero M, Hernandez-Tenorio C and Kovachev L M 2011, Hiden features of the soliton adaptation law to external potentials: optical and matter-wave 3D nonautonomous soliton bullets Laser Phys. 21/1 258-63 DOI 10.1134/ S1054660X11010038 ISSN 1054-660X.

3. Kovachev L M and Kovachev K L 2011, Ionization-free filamentation in gases Proc. SPIE 7751 7775128-1-9 DOI 10.1117/12.87921.

4. Belyaeva T L, Hernandez-Tenorio C, Perez-Torres R, Kovachev L M and Serkin V N, Enigmas of optical and matter-wave nonlinear soliton tunneling effects Proc. SPIE 7747 77471N ISSN 0277786X ISBN 978-081948237-2 DOI 10.1117/12.881617.

5. Perez-Torres R, Belyaeva T L, Hernandez-Tenorio C, Kovachev L M and Serkin V N 2011 Enhanced soliton spectral tunneling effect of self-compressing nonautonomous colored femtosecond solitons Proc. SPIE 7747 77471L ISSN 0277786X ISBN 978-081948237-2 DOI 10.1117/12.881660.

6. Hernandez-Tenorio C, Belyaeva T L, Perez-Torres R, Kovachev L M and Serkin V N, Hidden features of soliton adaptation law to external potentials: Optical and matter-wave soliton bullets in nonautonomous and nonlinear systems Proc. SPIE 7747 77471G ISSN 0277786X ISBN 978- 081948237-2 DOI 10.1117/12.881663.

7. Belyaeva T L, Hasegawa A, Kovachev L M and Serkin V N 2011, 3D soliton-like bullets in nonlinear optics and Bose-Einstein condensates Proc. SPIE 7747 ISSN 0277786X ISBN 978-081948237-2 DOI 10.1117/12.88901.

8. Kancheva P, Dakova A, Dakova D, Slavchev V and Pavlov L 2011, Three- dimensional solutions of a vector type NLS equation with spatial dependence of the nonlinear refractive index Proc. SPIE 7747 77476L ISSN 0277786X ISBN 978-081948237-2.

2010 г.

1. Kovachev L M and Kovachev K L, Ionization-free filamentation in gases 18th Int. Symp. Gas and Flow Chem. Lasers & High Power Lasers Proc. SPIE 7751.

2. Kovachev K L, Ivanov L M, Serkin V N and Kovachev L M, Propagation of laser pulses in media with non-stationary optical and magnetic response J. Appl. Electr. 12/2 30-36.

3. Kovachev L, A class of localized solutions of the linear and nonlinear amplitude equations governing laser pulse propagation Proc. 3rd Int. Symp. Filamentation (31 May - 05 June, Crete, Greece) pp 115-116.

4. Ivanov L M, Serkin V N, Kovachev L M and Ivanov M L, Determination of fiber's parameters by non-linear optical method J. Appl. Electr. 12/2 36-43.

5. Kovachev L M and Kovachev K L, TH or THz generation in the femtosecond optics? Proc. 3rd Int. Symp. Filamentation (31 May - 05 June, Crete, Greece) pp 126-127.

6. Ivanov L M, Kovachev L M, Kovachev K L and Ivanov M L, Optical quartz fibers as nonlinear media Int. workshop on innovative ap-proaches to physical investigations INRNE Blagoevgrad Bulgaria Paradigma Publishing Sofia ISBN 989-954-326-123-9.

7. Kovachev K L, Ivanov L M, Kovachev L M and Tunchev I, Localized solutions of the linear and nonlinear amplitude equations gov-erning laser pulse propagation regime Int. workshop on innovative ap-proaches to physical investigations INRNE Blagoevgrad Bulgaria Paradigma Publishing Sofia ISBN 989-954-326-123-9.

КОНФЕРЕНЦИИ / 2010:

Kovachev L M, 3rd Int. Symp. Filamentation, 31 May - 05 June, Crete, Greece. Kovachev L M, 18th Int. Symp. Gas and Flow Chemical Lasers & High Power Lasers, Sofia, Bulgaria, 30 Aug. - 3 Sept. 2010. Kovachev L M, Conf. Appl. of Mathematics in Technical and Natural Sci., Sozopol, Bulgaria, June 2010, keynote lecture. Kovachev L M, 16th ISQE Laser Physics and Applications, Nesebar, Bulgaria, 2010.

2009 г.

1. Kovachev L M, New mechanism for THz oscillation of the nonlinear refractive index in air: particle-like solutions J. Modern Optics 56/16 1797-1803.

2. Serkin V N, Belyaeva T L, Khawaja U Al and Kovachev L M, Soliton bullets of compressing Bose- Einstein condensates J. Nanosci. Moletron. 6/2 1233-46.

3. Serkin V N, Belyaeva T L, Viligran E V, Morales L C, Kovachev L M, Pena R M and Gorro G H, Derivation de la ecuacion no lineal de Schrodinger para el modelo de DNA J. Nanosci. Moletron. 6/2 1263-72.

4. Serkin V N, Belyaeva T L, Hernandez C T, Kovachev L M, Pena R M, Morales L C and Gorro G H, Posibilidad de generation de balas solitonicasen un laser atomico: Illuctration de analogia entre laser optica y laser atomico J. Nanosci. Moletron 6/2 1281-90.

5. Kovachev L M, Group-phase velocity difference and THz oscillation of the nonlinear refractive index: particle-like solutions 1st Int. Conf. Appl. Mathematics in Techn. Natural Sci. (Sozopol, Bulgaria) AIP Proc. 1186 69-81 ISBN: 978-0-7354-0752-7.

6. Kovachev L M, Kovachev K L and Tunchev I, Femtosecond pulses in air: linear and nonlinear regime Int. Conf. Ultrafast and Nonlinear Optics (Sept. 2009 Bourgas Bulgaria) Proc. SPIE 7501 75010E DOI: 10.1117/12.849380

7. Ivanov L M, Non-linear optical method for measurement of fibre parameters Proc. Third Int. Sci. Conf. FMNS 2009 2116-20.

2008 г.

1. Kovachev L M, Beyond the spatio-temporal model in femtosecond optics, J Modern Optics 2008;55/17:2975-81.

2. Kovachev L M, Kovachev K L, Diffraction of femtosecond pulses: nonparaxial regime, J Opt Soc Am A 2008;25/9:2232-43.

3. Kovachev L M; Kovachev K L, Diffraction of femtosecond pulses. Nonparaxial regime: erratum, J Opt Soc Am A 2008;25/12:3097-8.

2007 г.

1. Kovachev L M, Tunchev I, Dynamics of femtosecond laser pulses in air and in vacuum, Proc SPIE 2007;6604:66041G.

2. Kovachev L M, Collapse arrest and wave-guiding of femtosecond pulses, Optics Express 2007;15/16:10318-23.

3. Kovachev L M, Nonparaxial evolution of femtosecond optical pulses, Proc SPIE 2007;6582.

4. Serkin V N, Kovachev L M, Belyaeva T L, Exactly inferable models for optical solitons amplifications: analytical and computational studies, Proc SPIE 2007;6604:6604IV.

5. Serkin V N, Hasegawa A, Kovachev L M, Pena R, Morales L, La posibilidad degeneracion de las balas solitonicas en un laser atomico, Proc V Foro Int de Investigacion Nanotron'2007, 29-30 (2007, Puebla, Mexico).

6. Vargas V, Serkin V N, Kovachev L M, Pena R, Morales L, Derivacion de la ecuacion nolineal de Schrodinger para el modelo de ADN, Proc V Foro Int de Investigacion Nanotron'2007, (2007, Puebla, Mexico).

7. Serkin V N, Hasegawa A, Kovachev L M, Belyaeva T L, Optical soliton amplification in fiber optics systems with varying dispersion, Proc IEEE Int Conf Cerma'2007, (2007, Cuernavaca, Mexico).

8. Kovachev L M, Ivanov L, Tunchev I, Ultra-short optical pulses in media with non-stationary optical and magnetic response, Proc SPIE 2007;6604:66041H.

9. Pavlov L I, Kovachev L M, Dakova D Y, Naboko S V, Stoimenova D V, Pavlov R L, Pavlova S I; Tabanliyski I Y, Penchev S P, Effect of parametric processes on the stimulated Raman scattering in fibers, Proc SPIE 2007;6604:66041R.

10. Arabadjiev T, Uzunov I M, Modulation instability of stochastic optical waves in nonlinear media with anomalous dispersion, Proc SPIE 2007;6604:66041L.

11. Kovachev K, Ivanov L, Serkin V, Tunchev I, Kovachev L, Nonlinear dynamics of femtosecond pulses with one or few optical cycles in media with non stationary optical and magnetic response, Proc Int Conf FMNS'2007 (2007, Blagoevgrad, Bulgaria) pp87-92.

12. Kovachev L, Ivanov L, Serkin V, Tunchev I, Kovachev K, Slowly-varying equation of amplitudes in media with non stationary optical and magnetic response. Negative group velocity, Proc Int Conf FMNS'2007 (2007, Blagoevgrad, Bulgaria) pp93-8.

13. Arabadzhiev TN, Uzunov IM, Amplification of solitary optical waves in fibers with positive group velocity dispersion, Central European J Phys 2007;5/1:62-68.

2006 г.

1. Kovachev LM, Pavlov LI, Ivanov LM, Dakova DY, Optical filaments and optical bullets in dispersive nonlinear media, J Russian Laser Research, 2006;27:185-203.

2005 г.

1. Kovachev LM, Pavlov LI, Ivanov LM, Dakova DY, Relative linear stability of light bullets, Proc 4th Int Symp Laser Technol and Lasers, October 2005, Plovdiv, Bulgaria, pp 184-193.

2. Kovachev LM, Ivanov LM, Vortex solitons in dispersive nonlinear Kerr type media, Proc SPIE, Nonlinear Optics Applications, 2005;5949/07:1-12.

3. Pulov V, Uzunov IM, Chakarov E, Two light modes propagation in nonlinear media with negative cross-phase modulation via Lie group analysis, Proc SPIE, Laser Physics and Applications, 2005;5830:100-104.

4. Pulov V, Uzunov IM, Chakarov E, Symmetry properties of nonlinear pulse propagation in nonlinear birefringent optical fibers with Stimulated Raman scattering, Two light modes propagation in nonlinear media with negative cross-phase modulation via Lie group analysis, Proc SPIE, Laser Physics and Applications;2005;5830:105-109.

5. Kovachev LM, Ivanov LM, Vortex solitons, Los Allamos E-mail Lab., 2005; 1: Paper arXin:nlin.PS/0504020.

6. Kovachev LM, Ivanov LM, Propagation of ultra short optical pulses in dispersive Kerr type media with no-stationary response, Proc First Int Conf FMNS, Blagoevgrad, Bulgaria, 2005, pp 198-205.

7. Uzunov IM, Pulov V, Vector solitary wave solutions to coupled nonlinerar Schrodinger equations with Raman terms, Proc Second Int Congress Mechanical and Electrical Engineering and Marine Industry (MEEMI-2005), 2005;3:187-190.

8. Pulov V, Uzunov IM, Chakarov E, Lyutskanov V, Lie group symmetry reduction of two coupled nonlinear Schrodinger equations, Proc Second Int Congress Mechanical and Electrical Engineering and Marine Industry (MEEMI-2005), 2005;3:191-195.

9. Uzunov IM, Optical fiber communication systems, Proc ХХХIII National Conf Physics and Information and Communication Technologies, Varna, Bulgaria, 2005, pp 18-25 (in Bulgarian).

2004 г.

1. Kovachev L, Optical vortices in dispersive nonlinear Kerr type media, Int J Mathematics and Mathematical Sciences 2004;18:949-967.

2. Kovachev L, Optical leptons, Int J Mathematics and Mathematical Sciences 2004;27:1403-1422.

3. Kovachev L, Vortex solutions of the nonlinear optical Maxwell-Dirac equations, Physica D-Nonlinear Phenomena 2004;190:78-92.

4. Kovachev L, Kaymakanova N, Dakova D, Pavlov L, Rousev R, Donev S, Pavlov R, Three-dimensional solutions in media with spatial dependence of the nonlinear refractive index, Journal of Physical Studies 2004;8:137-140.

5. Kovachev L, Ivanov L, Simeonov D, Arabadzhiev T, Stability of optical vortices with integer spin, Proc Int Conf Nonlinear wave-guide phenomena, Toronto, Canada 2004;TuC27:1-3.

6. Kovachev L, Nonlinear amplitude Maxwell-Dirac equations. Optical leptons, Proc 5th Int Conf Symmetry in Nonlinear Mathematical Physics, Kyiv, Ukraine 2004;2:843-850.

7. Arabadzhiev T, Uzunov I, Frequency characteristics of stationary optical pulses in lightwave communication systems with periodical gain created by semiconductor amplifiers, Optical Fiber Technology 2004;10:171-186.

8. Uzunov I, Arabadzhiev T, Frequency conversion by means of semiconductor optical amplifiers with gain modulation and four-wave mixing, Е+Е 2004;3-4:26-32 (in Bulgarian).

2003 г.

1. Arabadziev T, Uzunov I, Stable optical pulse propagation in fiber optics transmission line with semiconductor optical amplifiers, Proc SPIE 2003;5226:89-93.

2. Arabadziev T, Uzunov I, Amplification of an optical pulses sequence in semiconductor optical amplifiers, Proc. SPIE 2003;5226:84-88.

3. Arabadziev T, Uzunov I, Ferdinandov E, Stationary optical pulses in fiber optic communication systems using semiconductor amplifiers for periodic amplification, Electrical Engineering and Electronics (Е+Е) 2003;5-6:20-26.

4. Arabadziev T, Uzunov I, Ferdinandov E, Frequency characteristics of Stationary optical pulses in fiber optic communication systems using semiconductor amplifiers for periodic amplification, Electrical Engineering and Electronics (Е+Е) 2003;10-12:40-46.

2002 г.

1. R. Andersen, L.M. Kovachev, Interaction of coupled optical vortices, JOSA B 2002, 19, pp. 376-384.

2. 23. D.R. Andersen, L.M. Kovachev, Interaction of coupled vector optical vortices, JOSA B, 2, (2002), pp. 1-501.

2001 г.

1. I.M. Uzunov, Stable optical pulse propagation in a dissipative nonlinear medium Eleventh Internationl school on quantum electronics, 19-22, September 2000, Varna , Bulgaria., Proc. SPIE , 4397, (2001), pp.171-175.