function and the stellar space density in the solar neighbourhood”. Astrophysics (). Arakelian, M. A. (1969-1970) “Study of the luminosity evolution of quasars based on the evolutionary effects associated with them”. Astrophysics and Soviet Astronomical Circular (). (A summary of these works was published in the journal Nature in 1970 vol. 225, p. 358-359.) Arakelian, M. A. (1969) “Statistical study of flare stars in the solar vicinity”. Communications of the Konkoly Observatory, Communications of BAO and reported at the conference “Non-periodic phenomena in variable stars” in 1969. Arakelian, M. A.; Kalloghlian, A.T. (1970) “Derivation of the luminosity function of field galaxies” Soviet Astronomy (). Arakelian, M. A. (1971) “The proof of the extragalactic origin of quasars.” Astrophysics and Bulletin of the USSR Acad. Sci. () Arakelian, M. A.; Dibai, E.A.; Esipov, V.F. (1973) “Spectroscopic observations and studies of a few hundred Markarian galaxies and discovery of more than 40 new Seyferts among them” Astrophysics and Soviet Astronomical Circular Arakelian, M. A. (1974) “Analysis of the surface brightness of emission-line galaxies (including Seyfert and Markarian ones) and development of a method for revealing galaxies with high surface brightness” Astrophysics Arakelian, M. A. (1973) “Suggestion of a new method for definition of space density of extragalactic objects and estimation of the mean density of matter in the Metagalaxy” Astrophysics Arakelian, M. A. (1975) “Galaxies of high surface brightness” Communications of BAO Arakelian, M. A. (1975) “Derivations of the luminosity function and space density of galaxies with UV continuum (Markarian galaxies)”, Soviet Astronomy Arakelian, M. A.; Dibai, E.A.; Esipov, V.F. (1975) “Spectroscopic observations and studies of Arakelian galaxies (galaxies with high surface brightness) and discovery of new Seyferts among them” Astrophysics and Soviet Astronomical Circular and reported in the meeting “Stars and galaxies from observational points of view” in 1975. Arakelian, M. A. (1976) “Study of the dependence of the emission-line intensities of Markarian and Seyfert galaxies on their color index” Astrophysics Arakelian, M. A. (1978) “Study of the distribution of the mean surface brightness of galaxies in the Coma cluster” Astrophysics Arakelian, M. A.; Kandalyan, R.A. (1980) “Study of the relation between the mean surface brightness and radio emission of galaxies, including Seyfert galaxies” Astrophysics Arakelian, M. A.; Kritsuk, A.G. (1981) “Study of the estimations of the kinetic energies of clusters of galaxies; the extent to which a kinetic energy estimate would be affected by a possible mass dependence of the velocity