1. Geothermal Well Cost Analyses 2006;Petty,2006
2. Cost analysis of oil, gas, and geothermal well drilling;Lukawski;J Pet Sci Eng,2014
3. The future of geothermal energy;Tester,2006
4. Geothermal Energy: An Alternative Resource for the 21st Century;Gupta,2006
5. Considerations for a Hard-Rock PDC Drill Bit;Glowka,1985