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Tolstaya, T. P.; Egorova, L. D.; Lisichkina, I. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1985 , vol. 21, # 4 p. 392 - 396
Khimiya Geterotsiklicheskikh Soedinenii, 1985 , vol. 21, # 4 p. 474 - 478