Gracheva, I. N.; Ioffina, D. I; Tochilkin, A. I.; Gorkin, V. Z.
Pharmaceutical Chemistry Journal, 1991 , vol. 25, # 3 p. 160 - 165
Khimiko-Farmatsevticheskii Zhurnal, 1991 , vol. 25, # 3 p. 18 - 21

Gracheva, I. N.; Ioffina, D. I; Tochilkin, A. I.; Gorkin, V. Z.
Pharmaceutical Chemistry Journal, 1991 , vol. 25, # 3 p. 160 - 165
Khimiko-Farmatsevticheskii Zhurnal, 1991 , vol. 25, # 3 p. 18 - 21

Kulka; Van Stryk
Canadian Journal of Chemistry, 1955 , vol. 33, p. 1130,1135