Burnell, Robert H.; Caron, Stephane
Canadian Journal of Chemistry, 1992 , vol. 70, # 5 p. 1446 - 1454

Engler, Thomas A.; Sampath, Umashanker; Naganathan, Sriram; Velde, David Vander; Takusagawa, Fusao
Journal of Organic Chemistry, 1989 , vol. 54, # 24 p. 5712 - 5727

Brown et al.
Journal of the Chemical Society, 1951 , p. 2019