Vasil'eva,T.T.; Freidlina,R.Kh.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1976 , vol. 25, p. 2216 - 2218
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1976 , vol. 25, # 10 p. 2373 - 2375