Xu, Shi, Xueyan Liu, Amir Tabaković, and Erik Schlangen. “The Influence of Asphalt Ageing on Induction Healing Effect on Porous Asphalt Concrete”. RILEM Technical Letters 30 (February 18, 2019): 98-103. Accessed October 14, 2019. http://letters.rilem.net/index.php/rilem/article/view/74.