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Ivanov, E. I. Kalayanov, G. D. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1992 , vol. 28, # 4 p. 428 - 429 Khimiya Geterotsiklicheskikh Soedinenii, 1992 , # 4 p. 511 - 512
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Ivanov, E. I. Kalayanov, G. D. Yaroshchenko, I. M. Chemistry of Heterocyclic Compounds (New York, NY, United States), 199 , vol. 26, # 7 p. 88 - 89 Khimiya Geterotsiklicheskikh Soedinenii, 199 , # 7 p. 997 - 998