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Chemistry of Heterocyclic Compounds (New York, NY, United States), 1968 , vol. 4, p. 415 - 416
Khimiya Geterotsiklicheskikh Soedinenii, 1968 , vol. 4, # 3 p. 561 - 562
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Lukevits,E. et al.
J. Gen. Chem. USSR (Engl. Transl.), 1969 , vol. 39, p. 1784 - 1787,1747 - 1750