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Cayzer, Tory N.; Lilly, Michael J.; Williamson, Rachel M.; Paddon-Row, Michael N.; Sherburn, Michael S.
Organic and Biomolecular Chemistry, 2005 , vol. 3, # 7 p. 1302 - 1307

Crombie et al.
Journal of the Chemical Society, 1951 , p. 2906,2912
Journal of the Chemical Society, 1956 , p. 3963,3969