Mizuno, Takumi; Daigaku, Takayuki; Nishiguchi, Ikuzo
Tetrahedron Letters, 1995 , vol. 36, # 9 p. 1533 - 1536

Barton,D.H.R. et al.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1975 , p. 1568 - 1574