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Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , p. 161 - 163
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 2 p. 197 - 199

Iwao; Lee; Castle
Journal of Heterocyclic Chemistry, 1980 , vol. 17, # 6 p. 1259 - 1264