1. N. A. Abramenko, A. V. Bagrov, Y. F. Nikitin, et al., Astronomicheskij Tsirkulyar, No. 518, 4 (1969).
2. Adaptivnaya optika, Ed. by E. A. Vitrichenko (Mir, Moscow, 1980) [in Russian].
3. V. L. Afanasiev, Y. Y. Balega, M. A. Grudzinsky, et al., Tekhnika sredstv svyazi. Ser. Tekhnika televideniya,No. 3, 13 (1987).
4. V. L. Afanasiev and A. V. Moiseev, Astronomy Letters 31 (3), 194 (2005).
5. H. W. Babcock, Astrophys. J. 107, 73 (1948).