Angyal,S.J.; Tate,M.E.
Journal of the Chemical Society, 1965 , p. 6949 - 6955

Tsukayama, Masao; Oda, Akihiro; Kawamura, Yasuhiko; Nishiuchi, Masaki; Yamashita, Kazuyo
Tetrahedron Letters, 2001 , vol. 42, # 35 p. 6163 - 6166