Iesce, M. Rosaria; Graziano, M. Liliana; Cimminiello, Guido; Cermola, Flavio; Parrilli, Michelangelo; Scarpati, Rachele Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1991 , # 7 p. 1085 - 1089