1. K. A. Barkhatova, Astron. Zh. 33, 556 (1956).
2. A. F. Seleznev, Astron. Tsirk. No. 1531, 9 (1988).
3. P. N. Kholopov, Star Clusters (Nauka, Moscow, 1981) [in Russian].
4. V. M. Danilov, in Methods of Astronomical and Geodesic Investigations, Ed. by K. A. Barkhatova, Collected Vol. (Ural’sk. Gos. Univ., Sverdlovsk, 1984), p. 94 [in Russian].
5. V. M. Danilov and A. P. Ryazanov, Astronomical and Geodesic Investigations, Ed. by K. A. Barkhatova, Collected Vol. (Ural’sk. Gos. Univ., Sverdlovsk, 1985), p. 19 [in Russian].