Clewlow, Paul J.; Jackson, Anthony H.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1990 , # 7 p. 1925 - 1936
Rao, Y. Koteswar; Nagarajan, M.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1983 , vol. 22, # 6 p. 519 - 520