1. Shell International Exploration and Production Inc., Houston, TX 77025; formerly, The PoroMechanics Institute, School of Civil Engineering and Environmental Science, The Univ. of Oklahoma, Norman, OK 73019.
2. The PoroMechanics Institute, Mewbourne School of Petroleum and Geological Engineering, School of Civil Engineering and Environmental Science, The Univ. of Oklahoma, Norman, OK 73019.