Mohd Sari, Kamarul Aini, Sohif Mat, Khairiah Badri, and Abdul Rahim M. Sani. 2014. “Properties of Structural Lightweight Concrete Filled With Palm-Based Polyurethane”. International Journal of Integrated Engineering 6 (1). https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/881.