Petty, Susan; Adair, Richard G. & Livesay, Bill. Evaluation of small diameter coreholes for reservoir information, article, January 1, 1992; (https://digital.library.unt.edu/ark:/67531/metadc873082/m1/1/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .