Bergmann et al.
Journal of the American Chemical Society, 1957 , vol. 79, p. 4174,4177

Mei, Zhen-Wu; Omote, Takumi; Mansour, Mounir; Kawafuchi, Hiroyuki; Takaguchi, Yutaka; Jutand, Anny; Tsuboi, Sadao; Inokuchi, Tsutomu
Tetrahedron, 2008 , vol. 64, # 47 p. 10761 - 10766

Bergmann et al.
Journal of the American Chemical Society, 1957 , vol. 79, p. 4174,4177

Ando,T. et al.
Bulletin of the Chemical Society of Japan, 1967 , vol. 40, p. 1275 - 1278