Gansaeuer, Andreas; Klatte, Max; Braendle, Gerhard M.; Friedrich, Joachim
Angewandte Chemie - International Edition, 2012 , vol. 51, # 35 p. 8891 - 8894

Calogeropoulou, Theodora; Hammond, Gerald B.; Wiemer, David F. Journal of Organic Chemistry, 1987 ,  vol. 52,  # 19  p. 4185 - 4190