Yu, Chung-Shan; Niikura, Kenichi; Lin, Chun-Cheng; Wong, Chi-Huey Angewandte Chemie - International Edition, 2001, vol. 40, # 15 p. 2900 - 2903 doi: 10.1002/1521-3773(20010803)40:15<2900::AID-ANIE2900>3.0.CO;2-4