Martynov, I. V.; Brel', V. K.; Uvarov, V. I.; Pomytkin, I. A.; Aleinikov, N. N.; Kashtanov, S. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1988 , vol. 37, p. 386 - 387 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1988 , # 2 p. 466 - 467