Hewkin, Cheryl T.; Jackson, Richard F. W.; Clegg, William
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1991 , # 12 p. 3091 - 3102

Hewkin, Cheryl T.; Jackson, Richard F. W.; Clegg, William Tetrahedron Letters, 1988 ,  vol. 29,  # 38  p. 4889 - 4892