Verheijdt, Paul L.; Cerfontain, Hans
Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1983 , # 9 p. 1343 - 1349

Turro, Nicholas J.; Shima, Kennosuke; Chung, Chao-Jen; Tanielian, Charles; Kanfer, Sheldon
Tetrahedron Letters, 1980 , vol. 21, p. 2775 - 2778