Raof, Hussein Burhan, and Mohammed Qadir Ismael. “Effect of PolyPhosphoric Acid on Rutting Resistance of Asphalt Concrete Mixture”. Civil Engineering Journal 5, no. 9 (September 1, 2019): 1929–1940. Accessed June 29, 2025. http://civilejournal.org/index.php/cej/article/view/1563.