Prokof'ev, A. I.; Vol'eva, V. B.; Novikova, I. A.; Belostotskaya, I. S.; Ershov, V. V.; Kabachnik, M. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1980 , vol. 29, # 12 p. 1883 - 1887 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1980 , # 12 p. 2707 - 2711