1. Formerly Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, Massachusetts, USA; presently University of Houston, Earth and Atmospheric Sciences, Houston, Texas, USA..
2. Kuwait University, Petroleum Engineering Department, Safat, Kuwait..
3. Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Earth Resources Laboratory, Cambridge, Massachusetts, USA..
4. University of Houston, Earth and Atmospheric Sciences, Houston, Texas, USA..