Shuikin,N.I. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1961 , p. 1547 - 1551
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1961 , # 9 p. 1660 - 1665
Viktorova,E.A. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1963 , p. 1162 - 1164
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1963 , # 7 p. 1277 - 1280