Amosova, S. V.; Musorin, G. K.; Trofimov, B. A.; Keiko, V. V. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1985 , vol. 34, p. 2597 - 2599 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1985 , # 12 p. 2800 - 2803