1. * Signs of gas flows in the variable Balmer line profiles of the Seyfert galaxy nuclei NGC 3227 and NGC 7469 / I. I. Pronik // Astron. and Astrophys.- 2009.- Vol. 496, No. 2.- P. 299 - 305.

2. * Investigation of forbidden line variability in Seyfert galaxy nuclei at Crimean observatory in 1971-2006 / I. I. Pronik // Nuclear Region, Host Galaxy and Environment of Active Galaxies: Proceed. Symp., held in Huatulco, Mexico, April 18-20, 2007 / Ed by E. Benitez et al.- Mexico: Univ. Nacional, 2008.- P. 37 - 39.- (Revista Mexicana de Astron. y. Astrofis. Ser. Conf.; Vol. 32).

3. * Night to night variability of the emission lines in the nuclear spectrum of the Seyfert galaxy NGC 3227 / I. I. Pronik, L. P. Metik, L. M. Sharipova // Nuclear Region, Host Galaxy and Environment of Active Galaxies: Proceed. Symp., held in Huatulco, Mexico, April 18-20, 2007 / Ed by E. Benitez et al.- Mexico: Univ. Nacional, 2008.- P. 47 – 48.- (Revista Mexicana de Astron.y Astrofis. Serie de Conf.; Vol. 32).

4. * Investigation of forbidden line variability in Seyfert galaxy nuclei at Crimean observatory / I. I. Pronik // The Central Engine of Active Galactic Nuclei: Proceed., held 16-21 Oct., 2006 at Xi'an Jioatong Univ., Xi'an, China / Ed. by L. C. Ho, J.-M. Wang. - San Francisco: ASP, 2007.- P. 554 - 556.- (ASP Conf. Ser.; Vol. 373).

5. * Night-to-night variability of the emission lines in the spectrum of the Seyfert galaxy NGC 3227 nucleus / L. P. Metik, I. I. Pronik, L. M. Sharipova // Astrophysics.- 2006.- Vol. 49, No. 4.- P. 427 – 438 = Переменность от ночи к ночи эмиссионных линий в спектре ядра сейфертовской галактики NGC 3227 / Л. П. Метик, И. И. Проник, Л. М. Шарипова // Астрофизика.- 2006.- Т. 49, Вып. 4.- С. 499 – 510.

6. * Long-term variability of the optical emission lines In the nuclear spectrum of the Seyfert galaxy NGC 3227 / I. I. Pronik, L. P. Metik // Astrophys. and Space Sci.- 2005.- Vol. 299, No. 3.- P. 245 - 261.

7. * Flows and shocks in variable fluxes of seyfert galaxies / I. I. Pronik // Recycling Intergalactic and Interstellar Matter: Proceed. of the IAU Symp. No. 217, held 14-17 July, 2003 in Sydney, Australia / Ed. by P.-A. Duc et al. - Dordrecht etc.: ASP.- P. 360 - 361.

8. * Synchrotron jet model for the 1989-1996 cycle of activity of NGC 4151 / I. I. Pronik // Recycling Intergalactic and Interstellar Matter: Proceed. of the IAU Symp. No. 217, held 14-17 July, 2003 in Sydney, Australia / Ed. by P.-A. Duc et al. - Dordrecht etc.: ASP, 2004. - P. 358 - 359.

9. * Characteristics of the continuum variability of the nucleus of NGC 4151 in the optical from 1989-1996 / N. I. Merkulova, L. P. Metik, I. I. Pronik // Astron. and Astrophys.- 2001.- Vol. 374, No. 3.- P. 770 - 783.

10. * Characteristics of the variability of the nucleus of NGC 1275 in the optical in 1982-1994 / I. I. Pronik, N. I. Merkulova, L. P. Metik // Astron. and Astrophys.- 1999.- Vol. 351, No. 1.- P. 21 - 30.

11. * Simultaneous UBVRI light curves of the Seyfert galaxy NGC 4151 during the extraordinary brightnening from 1989 to 1996 / N. I. Merkulova, L. P. Metik, I. I. Pronik // The Astron. Journ.- 1999.- Vol. 117, No. 5.- P. 2177 – 2184.

12. * UBVRI observations of the nucleus of NGC 1275 from 1989 to 1994: Microvariability / I. I. Pronik, N. I. Merkolova, L. P. Metik // The Astron. Journ.- 1999.- Vol. 117, No. 5.- P. 2141 - 2151.

13. * Long and short-term variability of the emission lines in the nuclear spectrum of the Seyfert galaxy NGC 7469 / I. I. Pronik, L. P. Metik, N. I. Merkulova // Astron. and Astrophys.- 1997.- Vol. 318.- P. 721 - 728.

14. * Differences in the emission line spectrum at maximum and minimum of the nuclear brightness of the Seyfert galaxy NGC 7469 / I. I. Pronik, L. P. Metik, N. I. Merkulova // Astrophys. and Space Sci.- 1996.- Vol. 239, No. 1.- P. 97 – 111.

15. * Interaction of low- And high-velocity systems in the galaxy NGC 1275 / I. I. Pronik, L. P. Metik // Astrophysics.- 1996.- Vol. 39, No. 4.- P. 334 – 350 = К вопросу о взаимодействии систем низкой и высокой скоростей в галактике NGC 1275 / И. И. Проник, Л. П. Метик // Астрофизика.- 1996.- Т. 39, Вып. 4.- С. 568 - 584.

16. * Multiwavelength observations of short-timescale variability in NGC 4151. I. Ultraviolet observations / D. M. Crenshaw, P. M. Rodriguez-Pascual, S. V. Penton,.. K. K. Chuvaev,.. V. T. Doroshenko,.. Yu. F. Malkov,.. N. I. Merkulova, L. Metik,.. I. I. Pronik, V. I. Pronik,.. S. G. Sergeev et al. // The Astrophys. Journ.– 1996.– V. 470, No. 1.– P. 322 – 335.

17. * Steps toward determination of the size and structure of the broad-line region in active galatic nuclei. VIII: an intensive HST, IUE, and ground-based study of NGC 5548 / K. T. Korista, D. Alloin, P. Barr,.. K. K. Chuvaev,.. V. Doroshenko,.. Yu. F. Malkov,.. N. Merkulova, L. Metik,.. I. I. Pronik, V. I. Pronik,.. S. G. Sergeev et al. // The Astrophys. Journ. Suppl. Ser.– 1995.– Vol. 97, No. 2.- P. 285 – 330.

18. * Conference on active galactic nuclei: Crimean Astrophysical Observatory, October 1992 / I. I. Pronik, V. I. Pronik // Astronomy Letters.- 1993.- Vol. 19, No. 5.- P. 403 – 404 = Конференция по активным ядрам галактик: (Крымская астрофизическая обсерватория, Октябрь 1992 г.) / И. И. Проник, В. И. Проник // Письма в Астрон. журн.: Хроника.- 1993.- Т. 19, № 10.- С. 990 - 992.

19. * A comparison of optical and radio structures of NGC 1275 galaxy / I. I. Pronik, L. I. Matveenko // Astrophys. and Space Sci.- 1990.- Vol. 164, No. 2.- P. 285 - 294.

20. * Investigation of the Nuclear Region of NGC1275 with High Angular Resolution / V. N. Dudinov, S. B. Novikov, I. I. Pronik et al. // Astronomy Letters.- 1990.- Vol. 16, No. 1.- P. 51 – 59 = Исследование с высоким угловым разрешением околоядерной области 1275 на горе Майданак / В. Н. Дудинов, С. Б. Новиков, И. И. Проник и др. // Письма в Астрон. журн.- 1990.- Т. 16, № 2.- С. 114 - 123.