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Khimiya Geterotsiklicheskikh Soedinenii, 1980 , vol. 16, # 11 p. 1511 - 1515

Prostakov, N. S.; Soldatenkov, A. T.; Fedorov, V. O.; Semikopnyi, A. I.; Sytinskii, I. A.; et al.
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Khimiko-Farmatsevticheskii Zhurnal, 1981 , vol. 15, # 8 p. 67 - 71