Joshi, U. K.; Paradkar, M. V.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1988 , vol. 27, # 1-12 p. 378 - 379
Berg, Ulf; Sandstroem, Jan; Jennings, W. Brian; Randall, David
Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1980 , p. 949 - 956