1. IBM Research−Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland
2. ExxonMobil Research and Engineering Company, Annandale, New Jersey 08801, United States
3. Energy Institute and Department of Chemical Engineering, City College of New York, New York City, New York 10031, United States
4. Schlumberger-Doll Research, Cambridge, Massachusetts 02139, United States