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2. Analysis of exploitation-induced gravity changes at Wairakei geothermal field;Allis;Geophysics,1986
3. Precise gravimetry and geothermal reservoir management;Allis,2000
4. Application of the self-potential method to geothermal exploration in Long Valley, California;Anderson;Journal of Geophysical Research,1976
5. Energy Information Administration. This is the official energy statistics from the U.S. government,2004