1. A. V. Beloshenkov, V. V. Kupriyanov, and A. K. Murtazov, Nablyud. Iskusstv. Nebesn. Tel, No. 88, 54 (1994).
2. T. Herels, in: Surfaces and Interiors of Planets and Satellites, A. Dollfuss, ed., London-New York, Academic Press (1970), pp. 367–430.
3. V. M. Grigorevskii and S. Ya. Kolesnik, Astron. Vestn., 12, 107–119 (1978).
4. V. V. Kupriyanov, A. K. Murtazov, and A. V. Yakovenko, Nablyud. Iskusstv. Nebesn. Tel, No. 88, 56 (1994).
5. V. I. Kuryshev and A. K. Murtazov, Paper deposited at VINITI, No. 6851 (1986).