Shaffie, Ekarizan, et al. “Relationship Between Rheological Properties of Nano Polymer Modified Asphalt Binder and Permanent Deformation of Asphalt Mixture ”. International Journal of Integrated Engineering, vol. 11, no. 6, Sept. 2019, pp. 244-53, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/4943.