1. Equilon Enterprises LLC, Westhollow Technology Center, P.O. Box 1380, Houston, Texas 77251-1380
2. Instituto de Carboquímica CSIC, C/ Miguel Luesma 4, 50015 Zaragoza, Spain
3. Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada T2N 1N4
4. 8805 Belhaven Court, Clemmons, North Carolina 27012