41. * Opposition polarimetry and photometry of the low albedo Asteroid 419 Aurelia / I. N. Belskaya, V. G. Shevchenko, Yu. S. Efimov, N. M. Shakhovskoy et al. // Asteroids, Comets, Meteors – ACM 2002: International Conference, 29 July - 2 Aug., 2002, Berlin, Germany / Ed. B. Warmbein. - Noordwijk, Netherlands: ESA, 2002.- P. 489 - 491.- (ESA SP; Vol. 500).

42. * Photopolarimetric monitoring of OJ 287 in 1994-1997 / Yu. S. Efimov, N. M. Shakhovskoy, L. O. Takalo, A. Sillanpaa // Astron. and Astrophys.- 2002.- Vol. 381, No. 2.- P. 408 - 419.

43. * Polarimetry of near-Earth asteroid 33342 (1998 WT24). Synthetic phase angle dependence of polarization for the E-type asteroids / N. N. Kiselev, V. K. Rosenbush, K. Jockers,.. N. M. Shakhovskoj, Yu. S. Efimov,.. V. V. Rumyantsev // Asteroids, Comets, Meteors – ACM 2002: International Conference, 29 July - 2 Aug., 2002, Berlin, Germany / Ed. B. Warmbein. - Noordwijk, Netherlands: ESA, 2002.- P. 887 – 890.– (ESA SP; Vol. 500).

44. * Antiglare protective optical filter for multipurpose rugged active matrix TFT color liquid crystal display / E. Kornitsky, Y. Efimov, Y. Popov et al. // The International Society for Optical Engineering.- B.m, 2001.- P. 227 - 234.- (Proceed. SPIE ; Vol. 4511).

45. * Diffraction-Limited Speckle Interferometry and Modeling of the Circumstellar Envelope of R CrB at Maximum and Minimum Light / K. Ohnaka, Y. Balega, T. Blocker, Yu. S. Efimov et al. // Astron. and Astrophys.- 2001.- Vol. 380, No. 1.- P. 212 – 220.

46. * Intensive monitoring of OJ 287 / T. Pursimo, L. Talkalo, Sillanpaa,.. Yu. S. Efimov,.. N. M. Shakhovskoy et al. // Astron. and Astrophys. Suppl.- 2000.- Vol. 146.- P. 141 - 155.

47. * Low-resolution spectro-polarimeter with broadband achromatic Plate and spectral Wollaston prism / Yu. S. Ivanov, R. E. Gershberg, Yu. S. Efimov, N. M. Shakhovskoy // Optical and IR Telescope Instrumentation and detectors: Conference, held in Munich, Germany, Mar. 27 – 31, 2000 / Ed. by M. Lye, A. F. M. Moorwood. – Bellingham, WA, USA: SPIE, 2000. - P. 497 - 508.- (Proceed. SPIE.; Vol. 4008).

48. * Photometric observations of the radio bright B[e] / X-ray binary CI Cam / J. S. Clark, A. S. Miroshnichenko, V. M. Larionov,.. Yu. S. Efimov et al. // Astron. and Astrophys.- 2000.- Vol. 356, No. 1.- P. 50 – 62.

49. * UV Cas: Photometry, Polarization, and Spectrum near Maximum Light / V. T. Doroshenko, Yu. S. Efimov, A. E. Rosenbush // Astronomy Letters.- 2000.- Vol. 26, No. 7.- P. 460 – 472 = UV Cas: фотометрия, поляриметрия и спектр вблизи максимума блеска / В. Т. Дорошенко, Ю. С. Ефимов, А. Э. Розенбуш // Письма в Астрон. журн.- 2000.- Т. 26, № 7.- С. 535 – 548.

50. * Brightening of the T Tauri star RY Tauri in 1996. Photometry, polarimetry and high-resolution spectroscopy / P. P. Petrov, G. V. Zajtseva, Yu. S. Efimov et al. // Astron. and Astrophys.- 1999. - Vol. 341, No. 2.- P. 553 - 559.

51. * The Extraordinary optical outburst of ON 231 (W Com) in spring 998 / E. Massaro, M. Maesano, F. Montagni,.. Yu. S. Efimov, N. M. Shakhovskoy et al. // Astron. and Astrophys.- 1999.- Vol. 342, No. 3. – P. L49 - L52.

52. * Position-Angle Variations of the Polarization Plane of Asteroid 4 Vesta / D. F. Lupisho, Yu. S. Efimov, N. M. Shakhovskoy // Solar System Research.- 1999.- Vol. 33, No. 1.- P. 45 – 48 = Вариации позиционного угла плоскости поляризации астероида 4 Веста / Д. Ф. Лупишко, Ю. С. Ефимов, Н. М. Шаховской // Астрон. вестник.- 1999.- Т. 33, № 1.- С. 50 – 54.

53. * What is happening in W COM (ON 231)? The extraordinary 1998 outburst / G. Tosti, E. Massaro, L. O. Villata, Yu. S. Efimov // BL Lac phenomenon: Meeting, held in Turku, Finland, Jun. 22 – 26, 1998 / Ed. by L. O. Takalo, A. Sillanpaa.- San Francisco: ASP, 1999. - P. 149 - 152.- (ASP Conf. Ser.; Vol. 159).

54. * Radio, optical and photopolarimetric observations of Markarian 421 around the great 1996-97 outburst / G. Tosti, M. Fiorucci, M. Luciani, Yu. S. Efimov, N. M. Shakhovskoy et al. // Astron. and Astrophys. – 1998.– Vol. 339, No. 1.– P. 41 - 51.

55. * Confirmation of the 12-year optical outburst cycle in blazer OJ 287 / A. Sillanpaa, L. O. Takalo, T. Pusimo,.. Yu. S. Efimov et al. // Astron. and Astrophys.– 1996.– Vol. 305, No. 2.– P. L17 – L20.

56. * Double-peak structure in the cyclic optical outbursts of blazer OJ 287 / A. Sillanpaa, L. O. Takalo, T. Pursimo,.. Yu. S. Efimov, N. M. Shakhovskoy et al. // Astron. and Astrophys.– 1996.– Vol. 315, No. 1.– P. L13 – L16.

57. * Monitoring of 3C 66A during an extended outburst. I. The light curves / L. O. Takalo, A. Sillanpaa, T. Pursimo,.. Yu. S. Efimov, N. M. Shakhovskoy et al. // Astron and Astrophys. Suppl. Ser.– 1996.– Vol. 120, No. 2.– P. 313 – 321.

58. * On the polarization opposition effect of E-type Asteroids 64 Angelina / N. M. Kiselev, N. M. Shakhovskoy, Yu. S. Efimov // Icarus. - 1996. - Vol. 120, No. 2 - P. 408 – 411.

59. * Variability characteristics of Blazar OJ287 / L. O. Takalo, A. Sillanpaa, T. Pursimo,.. Yu. S. Efimov, N. M. Shakhovskoj et al. // Extragalactic Radio Sources: Proceed. of the IAU Symp. No. 175, held in Bologna, Italy 10 -14 Oct., 1995 / Ed. by R. Ekers et al.– Dordrecht etc.: Kluwer Acad. Publ., 1996.– P. 45 - 46.

60. * Simultaneous UV, optical and radio monitoring of the BL Lac object OJ 287 in March 1993 / E. Pian, R. A. Wagner, S. J. Bregman,.. Yu. S. Efimov,.. N. M. Shakhovskoy et al. // Advances in Space Res.- 1995.- Vol. 16, No. 3.- P. 57 - 60.