Beifuss, Uwe; Tietze, Mario; Baeumer, Sebastian; Deppenmeier, Uwe Angewandte Chemie - International Edition, 2000, vol. 39, # 14 p. 2470 - 2472 doi: 10.1002/1521-3773(20000717)39:14<2470::AID-ANIE2470>3.0.CO;2-R