Usova, E. B.; Krapivin, G. D.; Kul'nevich, V. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 4 p. 477 - 482
Khimiya Geterotsiklicheskikh Soedinenii, 1990 , # 4 p. 557 - 562

Usova, E. B.; Krapivin, G. D.; Kul'nevich, V. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 4 p. 477 - 482
Khimiya Geterotsiklicheskikh Soedinenii, 1990 , # 4 p. 557 - 562