Stevens, David R.; Till, Clive P.; Whiting, Donald A.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1992 , # 2 p. 185 - 190

Stevens; Whiting
Tetrahedron Letters, 1986 , vol. 27, # 38 p. 4629 - 4632