Chemistry of Heterocyclic Compounds (New York, NY, United States), , vol. 29, # 2 p. 170 - 173
Khimiya Geterotsiklicheskikh Soedinenii, , # 2 p. 197 - 201

Shekhter, O. V.; Kuklenkova, O. B.; Sergovskaya, N. L.; Tsizin, Yu. S.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1993 , vol. 29, # 2 p. 170 - 173
Khimiya Geterotsiklicheskikh Soedinenii, 1993 , # 2 p. 197 - 201