Sazonova, N. M.; Levina, I. I.; Sladkov, V. I.; Suvorov, N. N.
Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 9.2 p. 1751 - 1756
Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 9 p. 1979 - 1985

Sazonova, N. M.; Levina, I. I.; Bezrukov, I. A.; Ershova, Yu. A.; Sladkov, V. I.; et al.
Pharmaceutical Chemistry Journal, 1991 , vol. 25, # 7 p. 465 - 469
Khimiko-Farmatsevticheskii Zhurnal, 1991 , vol. 25, # 7 p. 31 - 34