Malin, Peter E.; Shalev, Eylon; Lou, Min; Simiyu, Silas M.; Stroujkova, Anastasia & McCausland, Windy. A Comprehensive Study of Fracture Patterns and Densities in The Geysers Geothermal Reservoir Using Microearthquake Shear-Wave Splitting Tomography, report, February 24, 2004; (https://digital.library.unt.edu/ark:/67531/metadc779483/m1/1/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .