1. IBM Almaden Research Center, San Jose, California 95120, United States
2. DTU Energy, Frederiksborgvej
399, DK-4000 Roskilde, Denmark
3. Haldor Topsøe A/S, Nymøllevej
55, DK-2800 Kgs. Lyngby, Denmark
4. SUNCAT, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States