Freeman, Charles J.; Jones, Susanne B.; Padmaperuma, Asanga B.; Santosa, Daniel M.; Valkenburg, Corinne & Shinn, John. Initial Assessment of U.S. Refineries for Purposes of Potential Bio-Based Oil Insertions, report, April 25, 2013; (https://digital.library.unt.edu/ark:/67531/metadc870934/m1/1/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .