Lyukmanov, N. F.; Kovshev, E. I.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1985 , vol. 21, # 11 p. 1215 - 1218
Khimiya Geterotsiklicheskikh Soedinenii, 1985 , vol. 21, # 11 p. 1477 - 1480

Lyukmanov, N. F.; Kovshev, E. I. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1985 ,  vol. 21,  # 11  p. 1215 - 1218Khimiya Geterotsiklicheskikh Soedinenii, 1985 ,  vol. 21,  # 11  p. 1477 - 1480