Ismailsski
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Belozwetow
Zhurnal Obshchei Khimii, 1949 , vol. 19, p. 959,963
J. Gen. Chem. USSR (Engl. Transl.), 1949 , vol. 19, p. 949,952
Kolodyazhnaya, S. N.; Divaeva, L. N.; Polenov, V. A.; Simonov, A. M.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1992 , vol. 28, # 1 p. 58 - 63
Khimiya Geterotsiklicheskikh Soedinenii, 1992 , # 1 p. 67 - 72