1. B. E. Markarian, V. A. Lipovetskii, and J. A. Stepanian,Astrofizika,17, 619 (1981).
2. H. V. Abrahamyan and K. S. Gigoyan,Astrofizika,36, 181 (1993).
3. 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.
4. H. V. Abrahamyan, V. V. Hambaryan, and K. S. Gigoyan,Astron. Th.,71, 891 (1994).
5. 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).