Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 37, p. 2220 - 2222
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , # 11 p. 2466 - 2469
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 32, # 3 p. 514 - 519
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , # 3 p. 573 - 578