Laue, M.L. Economic Recovery of Oil Trapped at Fan Margins Using High Angle Wells and Multiple Hydraulic Fractures, report, November 1, 1999; (https://digital.library.unt.edu/ark:/67531/metadc626454/m1/1/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .