1. WinGOHFER simulator, Version 6.0. STIM-LAB Inc.: Duncan, OK and Marathon Oil Co.: Denver, CO, 1998.
2. TerraFrac simulator, Version 6.0. TerraTek Inc.: Salt Lake City, UT, 1998.
3. Numerical modelling of hydraulic fracturing in layered formations with multiple elastic moduli. In Rock Mechanics Contributions and Challenges, (eds). Balkema: Rotterdam, 1990; 303-309.