Belen'kaya, I. A.; Krokhina, G. P.; Andronati, S. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1982 , vol. 18, # 10 p. 1038 - 1040
Khimiya Geterotsiklicheskikh Soedinenii, 1982 , vol. 18, # 10 p. 1344 - 1346

Belen'kaya, I. A.; Krokhina, G. P.; Andronati, S. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1982 , vol. 18, # 10 p. 1038 - 1040
Khimiya Geterotsiklicheskikh Soedinenii, 1982 , vol. 18, # 10 p. 1344 - 1346

Warren,J.D. et al.
Journal of Heterocyclic Chemistry, 1979 , vol. 16, p. 1617 - 1624