Sharf, V. Z.; Taits, S. Z.; Gurovets, A. S.; Vol'kenshtein, Yu. B.; Fabrichnyi, B. P.; Shcherbakova, S. I.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1982 , vol. 18, # 2 p. 130 - 133
Khimiya Geterotsiklicheskikh Soedinenii, 1982 , vol. 18, # 2 p. 171 - 175
