Nazzal, Jamal. “The influence of Pyrolysis Conditions on the Products from the fixed-Bed Pyrolysis of the Jordanian Oil Shale”. Al-Balqa Journal for Research and Studies, vol. 12, no. 1, Aug. 2007, pp. 11-44, https://ajrs.ammanu.edu.jo/ojs/index.php/albalqajournal/article/view/336.