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Khimiya Geterotsiklicheskikh Soedinenii, , vol. 24, # 3 p. 390 - 395

Varlamov, S. V.; Kadorkina, G. K.; Kostyanovskii, R. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1988 , p. 320 - 325
Khimiya Geterotsiklicheskikh Soedinenii, 1988 , vol. 24, # 3 p. 390 - 395

Varlamov, S. V.; Shustov, G. V.; Shibaev, A. Yu.; Puzanov, Yu. V.; Chervin, I. I.; Kostyanovskii, R. G.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 4.2 p. 793 - 800
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 4 p. 882 - 890