Scott et al.
Journal of Applied Chemistry, 1952 , vol. 2, p. 368

Mayants, A. G.; Klinova, N. A.; Gordeichuk, S. S.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, # 7 p. 776 - 777
Khimiya Geterotsiklicheskikh Soedinenii, 1987 , # 7 p. 945 - 946