Chemistry of Heterocyclic Compounds (New York, NY, United States), , vol. 27, # 2 p. 142 - 146
Khimiya Geterotsiklicheskikh Soedinenii, , # 2 p. 175 - 180
Verin, S. V.; Kuznetsov, E. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1992 , vol. 28, # 2 p. 135 - 138
Khimiya Geterotsiklicheskikh Soedinenii, 1992 , # 2 p. 169 - 172