Shallsuku, Philip. “Modification and Evaluation of the Potential of Nigerian Bentonite Clays As Catalysts Support for Upgrading Heavy Crude Oil and Bitumen”. Journal of Chemical, Mechanical and Engineering Practices (JCMEP) 7, no. 1-3 (December 1, 2018): 11–38. Accessed September 19, 2024. http://icidr.org.ng/index.php/Jcmep/article/view/1108.