Seyferth, Dietmar; Pornet, Jacques
Journal of Organic Chemistry, 1980 , vol. 45, # 9 p. 1721 - 1722

Yasuda, Hajime; Yamauchi, Michihide; Ohnuma, Yasuo; Nakamura, Akira
Bulletin of the Chemical Society of Japan, 1981 , vol. 54, # 5 p. 1481 - 1491