1. G. A. Korn and T. M. Kom,Manual of Mathematics, McGraw-Hill, New York (1967).
2. R. A. Windhorst, G. M. van Heerde, and P. Katgert,Astron. Astrophys. Suppl. Ser.,58, 1 (1984).
3. A. A. Stotskii, A. B. Berlin, M. N. Kaidanovskii, and V. B. Khaikin,Preprint Special Astrophys. Obs.,20, 1 (1985).
4. A. V. Temirova,Astrofiz. Issled.,17, 131 (1983).
5. V. R. Amirkhanyan,Soobshch. Spets. Astrofiz. Obs.,53, 96 (1987).