Tochilkin, A. I.; Kovel'man, I. R.; Prokof'ev, E. P.; Gracheva, I. N.; Levinskii, M. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1988 , vol. 24, # 8 p. 892 - 897
Khimiya Geterotsiklicheskikh Soedinenii, 1988 , # 8 p. 1084 - 1090

Tochilkin, A. I.; Kovel'man, I. R.; Prokof'ev, E. P.; Gracheva, I. N.; Levinskii, M. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1988 , vol. 24, # 8 p. 892 - 897
Khimiya Geterotsiklicheskikh Soedinenii, 1988 , # 8 p. 1084 - 1090

Ukai
Yakugaku Zasshi, 1931 , vol. 51, p. 542,571; dtsch. Ref. S. 73, 76
Chem.Abstr., 1931 , p. 5427