Jain, M. L.; Soni, R. P.; Saxena, J. P.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1980 , vol. 19, # 8 p. 718 - 720

Neiland, O. Ya.; Kraupsha, I. L.; Gudele, I. Ya.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1993 , vol. 29, # 12 p. 1428 - 1434
Khimiya Geterotsiklicheskikh Soedinenii, 1993 , # 12 p. 1653 - 1661

Jain, M. L.; Soni, R. P.; Saxena, J. P.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1980 , vol. 19, # 8 p. 718 - 720