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Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 5 p. 567
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Russian Journal of Organic Chemistry, 2014 , vol. 50, # 2 p. 219 - 224
Zh. Org. Khim., 2014 , vol. 50, # 2 p. 226 - 231,6