Hanson, James R.; Wadsworth, Harry J.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1980 , p. 933 - 937
Crabb, Trevor A.; Dawson, Philip J.; Williams, Roger O.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1980 , p. 2535 - 2541