1. P. M. Zorkii, V. K. Bel'skii, S. G. Lazareva, and M. A. Porai-Koshits, Zh. Strukt. Khim.,8, No. 2, 312?316 (1967).
2. A. I. Kitaigorodskii, P. M. Zorkii, and V. K. Bel'skii, Structure of Organic Substances. Data from Structural Investigations 1929?1970 [in Russian], Nauka, Moscow (1980).
3. A. I. Kitaigorodskii, P. M. Zorkii, and V. K. Bel'skii, Structure of Organic Substances. Data from Structural Investigations 1971?1973 [in Russian], Nauka, Moscow (1982).
4. V. K. Bel'skii and P. M. Zorkii, Kristallografiya,15, No. 4, 704?709 (1970).
5. V. K. Belsky and P. M. Zorkii, Acta Crystallogr.,A33, No. 5, 1004?1006 (1977).