Rodina, L. L.; Verzhba, O. A.; Korobitsyna, I. K.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 12 p. 1345
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 12 p. 1694 - 1695