1. Section for Chemical Reactivity, Environmental Science and Technology Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
2. Ford Research Laboratory, Mail Drop SRL-3083, Ford Motor Company, P.O. Box 2053, Dearborn, Michigan 48121-2053
3. Ford Forschungszentrum Aachen, Dennewartstrasse 25, D-52068 Aachen, Germany