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Levchenko,N.K. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1973 , vol. 22, p. 1042 - 1046
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1973 , vol. 22, # 5 p. 1086 - 1090