Li, Pui-Kai; Pillai, Radhakrishnan; Young, Barry L.; Bender, William H.; Martino, Dino M.; Lin, Fu-Tyan
Steroids, 1993 , vol. 58, # 3 p. 106 - 111

Newman,M.S.; Karnes,H.A.
Journal of Organic Chemistry, 1966 , vol. 31, p. 3980 - 3984

Li, Pui-Kai; Pillai, Radhakrishnan; Young, Barry L.; Bender, William H.; Martino, Dino M.; Lin, Fu-Tyan
Steroids, 1993 , vol. 58, # 3 p. 106 - 111