Verma; Tripathi; Saxena; Shanker
European Journal of Medicinal Chemistry, 1994 , vol. 29, # 12 p. 941 - 946

Kelarev, V. I.; Shvekhgeimer, G. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1980 , vol. 16, # 5 p. 501 - 506
Khimiya Geterotsiklicheskikh Soedinenii, 1980 , # 5 p. 645 - 650

CIBA
Patent: US2505247 , 1946 ;

Kelarev, V. I.; Shvekhgeimer, G. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1980 , vol. 16, # 5 p. 501 - 506
Khimiya Geterotsiklicheskikh Soedinenii, 1980 , # 5 p. 645 - 650