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Heterocycles, 1984 , vol. 22, # 9 p. 1947 - 1949

Amato, Joseph S.; Karady, Sandor; Phillips, Brian T.; Weinstock, Leonard M.
Heterocycles, 1984 , vol. 22, # 9 p. 1947 - 1949

Yurovskaya, M. A.; Karchava, A. V.; Bundel, Yu. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1992 , vol. 28, # 9 p. 1000 - 1003
Khimiya Geterotsiklicheskikh Soedinenii, 1992 , # 9 p. 1187 - 1190