1. Advanced Systems Applications, Alberta Research Council, 3rd Floor, 6815 — 8 Street N.E., Calgary, Alberta, Canada T2E 7H7,
2. Petroleum Unit, Prime Minister's Office, Bandar Seri Begawan 2007, Brunei
3. Department of Physics, 412 Avadh Bhatia Physics Laboratory, University of Alberta, Edmonton, Alberta, Canada T6G 2J1,