Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 36, # 10 p. 2112 - 2114
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , # 10 p. 2280 - 2282

Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 36, # 10 p. 2112 - 2114
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , # 10 p. 2280 - 2282

Chemistry of Heterocyclic Compounds (New York, NY, United States), , vol. 22, # 2 p. 147 - 148
Khimiya Geterotsiklicheskikh Soedinenii, , vol. 22, # 2 p. 190 - 191