Gol'dfarb, Ya. L.; Bulgakova, V. N.; Fabrichnyi, B. P.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 12 p. 1283 - 1286
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 12 p. 1626 - 1629

Motoyama et al.
Nippon Kagaku Zasshi, 1957 , vol. 78, p. 779,783
Chem.Abstr., 1960 , p. 22559

Motoyama et al.
Nippon Kagaku Zasshi, 1957 , vol. 78, p. 779,783
Chem.Abstr., 1960 , p. 22559

Gol'dfarb, Ya. L.; Bulgakova, V. N.; Fabrichnyi, B. P.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 12 p. 1283 - 1286
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 12 p. 1626 - 1629