Campbell, John J.; Glover, Stephen A.; Hammond, Gerard P.; Rowbottom, Colleen A.
Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1991 , # 12 p. 2067 - 2080
Ayanoglu, Eser; Wegmann, Annemarie; Pilet, Olivier; Marbury, G. Dean; Hass, J. Ronald; Djerassi, Carl
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