DePuy, C. H.; Bierbaum, Veronica M.; Flippin, L. A.; Grabowski, Josef J.; King, Gary K.; et al.
Journal of the American Chemical Society, 1980 , vol. 102, # 15 p. 5012 - 5015

Niwayama, Satomi; Dan, Shigeyuki; Inouye, Yoshinobu; Kakisawa, Hiroshi
Chemistry Letters, 1985 , p. 957 - 960