Granik, V. G.; Grizik, S. I.; Ershov, L. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 12 p. 1341
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 12 p. 1691

Granik, V. G.; Ershov, L. V.; Grizik, S. I.; Chistyakov, V. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 9 p. 1026 - 1031
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , vol. 20, # 9 p. 1252 - 1256