Wolf et al.
Journal of the American Chemical Society, 1956 , vol. 78, p. 861,868

Bridge, Andrew W.; Hursthouse, Michael B.; Lehmann, Christian W.; Lythgoe, David J.; Newton, Christopher G.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1993 , # 16 p. 1839 - 1848