1. B. E. Markarian, V. A. Lipovetskii, and J. A. Stepanian,Astrofizika, 17,619 (1981).
2. K. S. Gigoyan, “Search for and investigation of late-type M and C stars on plates of the First Byurakan Spectral Sky Survey,” Dissertation, Byurakan Astrofiz. Obs., Byurakan (1994), p. 112.
3. H. V. Abrahamyan and K. S. Gigoyan,Astrofizika,31, 601 (1989);32, 501 (1990);33, 317 (1990);36, 431 (1993);37, 585 (1994);38, 211 (1995).
4. H. V. Abrahamyan, K. S. Gigoyan, and G. M. Shahabassian,Astrofizika,38, 351 (1995).
5. K. S. Gigoyan and V. V. Hambarian,Astrofizika,39, 517 (1996).