Thoma, Gebhard; Baenteli, Rolf; Jahnke, Wolfgang; Magnani, John L.; Patton, John T. Angewandte Chemie - International Edition, 2001, vol. 40, # 19 p. 3644 - 3647 doi: 10.1002/1521-3773(20011001)40:19<3644::AID-ANIE3644>3.0.CO;2-S