1. Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
2. Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland and Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland
3. Elektrizitäts-Gesellschaft Laufenburg AG, Lerzenstrasse 10 CH-8953 Dietikon, Switzerland
4. Westinghouse Atom AB, SE-72163 Västerås, Sweden