Oldenburg, C.M. & Benson, S.M. Carbon sequestration with enhanced gas recovery: Identifying candidate sites for pilot study, article, March 1, 2001; (https://digital.library.unt.edu/ark:/67531/metadc734879/m1/1/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .