Stoyanovich, F. M.; Marakatkina, M. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 12 p. 1346
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 12 p. 1695 - 1697