Krauze, A.A.; Pelcher, Yu.E'.; Kalme, Z.A.; Dubar, G.Ya.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 8 p. 935
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , # 8 p. 1140 - 1141

Krauze, A.A.; Pelcher, Yu.E'.; Kalme, Z.A.; Dubar, G.Ya.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 8 p. 935
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , # 8 p. 1140 - 1141

Krauze, A. A.; Liepin'sh, E. E.; Dubur, G. Ya.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, # 4 p. 472 - 473
Khimiya Geterotsiklicheskikh Soedinenii, 1987 , # 4 p. 563 - 564