Bumagin, N. A.; Andrykhova, N. P.; Beletskaya, I. P. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1988 , vol. 37, # 6 p. 1285 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1988 , # 6 p. 1449 - 1450