Mikhaleva, M. A.; Kolesnichenko, G. A.; Kizner, T. A.; Mamaev, V. P.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1988 , vol. 24, # 12 p. 1352 - 1354
Khimiya Geterotsiklicheskikh Soedinenii, 1988 , vol. 24, # 12 p. 1636 - 1639

Hoffmann-La Roche Inc.
Patent: US5039805 A1, 1991 ;

Terpinski, Jacek; Denney, Dorothy Z.; Beveridge, Richard; Cox, Phillip D.; Moss, Robert A.
Magnetic Resonance in Chemistry, 1987 , vol. 25, p. 923 - 927

Mikhaleva, M. A.; Kolesnichenko, G. A.; Kizner, T. A.; Mamaev, V. P.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1988 , vol. 24, # 12 p. 1352 - 1354
Khimiya Geterotsiklicheskikh Soedinenii, 1988 , vol. 24, # 12 p. 1636 - 1639