Trapentsier, P. T.; Kalvin'sh, I. Ya.; Liepin'sh, E. E.; Lukevich, E. Ya.; Bremanis, G. A.; Eremeev, A. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1985 , vol. 21, # 6 p. 646 - 650
Khimiya Geterotsiklicheskikh Soedinenii, 1985 , vol. 21, # 6 p. 774 - 778

Trapentsier, P. T.; Kalvin'sh, I. Ya.; Liepin'sh, E. E.; Lukevich, E. Ya.; Bremanis, G. A.; Eremeev, A. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1985 , vol. 21, # 6 p. 646 - 650
Khimiya Geterotsiklicheskikh Soedinenii, 1985 , vol. 21, # 6 p. 774 - 778