Rizpolozhenskii,N.I.; Muslinkin,A.A.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1961 , # 9 p. 1493 - 1498
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1961 , # 9 p. 1600 - 1606