1. (1) Clifton, R.J. and Abou-Sayed, A.S., A Variational Approach to the Prediction of the Three-Dimensional Geometry of Hydraulic Fractures, SPE/DOE Paper No. 9879, Proc. Low Permeability Symposium, Denver, Co., (1981), pp. 457-465.
2. (3) Kurashige, M. and Clifton, R.J., Integral Equations for the Problem of 3D Crack in an Infinite, Fluid-filled, Poroelastic Solid, SPE Production Engineering, February, (1992), pp. 34-38.
3. (4) Clifton, R.J. and Wang, J-J., Modeling of Poroelastic Effects in Hydraulic Fracturing, SPE 21871, SPE Rocky Mountain Regional Meeting/Low-Permeability Reservoir Symposium, Denver, Colorado, April, (1991), pp. 1-14.
4. (5) Guo, Q., Wang, J-J., Clifton R.J. and Mertaugh, L.J., Elastic Analyses of Planar Cracks of Arbitrary Shape, ASME J. Appl. Mech., Vol. 62 (1995), pp. 108-115.
5. (6) Kurashige, M. and Clifton, R.J., Integral Equations for a Three-Dimensional Crack in an Infinite, Fluid-Filled, Poroelastic Solid with Zero Permeability in One Direction, ASME J. Appl. Mech., Vol. 63 (1996), pp. 62-68.