1. Volume requirements for air and gas drilling;Angel;AIME Pet. Trans.,1957
2. Optimization by Variational Methods;Denn,1969
3. Geothermal electric power, the state of the world — 1985;Dippo,1985
4. Application and evaluation of the air-hammer in the Permian Basin;Downs;API Drill. Prod. Pract.,1960
5. Practical approach to air and gas volume requirements for air and gas drilling;Ikoku Chi,1980