Sharanina, L. G.; Promonenkov, V. K.; Marshtupa, V. P.; Pashchenko, A. V.; Puzanova, V. V.; et al. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1982 , vol. 18, # 6 p. 607 - 611 Khimiya Geterotsiklicheskikh Soedinenii, 1982 , vol. 18, # 6 p. 801 - 806