1. US 5.759.945 (1998 Arco); US 5.916.975 (1999 SmithKline Beecham); US 6.074.624 (2000;
2. van Leeuwen‐2 p.299;
3. Caprio/Williams Chapter 4; Maseras/Liedos; Mizuno; Tietze/Eicher/Diederichsen; Morokuma/Musaev Chapter 9; Ertl/Knözinger/Schüth/Weitkamp Vol. 7 p.3448;
4. Cornils/Herrmann‐3 p.412;