Snegirev, V. F.; Gervits, L. L.; Makarov, K. N.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, # 12 p. 2480 - 2489
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 12 p. 2765 - 2775