1. Schlumberger-Doll Research, Cambridge, Massachusetts 02139, United States
2. University of New Mexico, Electrical and Engineering Department, Albuquerque, New Mexico 87131, United States
3. Schlumberger Dhahran Carbonate Research Center, Dammam 31942, Kingdom of Saudi Arabia
4. Rose-Hulman Institute of Technology, Terre Haute, Indiana 47803, United States