1. Materials and Production, RISE Research Institutes of Sweden, P.O. Box 857, SE-50115 Borås, Sweden
2. ExxonMobil Research and Engineering Company, Annandale, New Jersey 08801, United States
3. Instituto Mexicano del Petroleo, Eje Central Lázaro Cárdenas Norte 152, Mexico City 07730, Mexico
4. Schlumberger-Doll Research, SLB, Cambridge, Massachusetts 02139, United States