Chuayjuljit, Saowaroj, Tarasai Sangpakdee, and Onusa Saravari. 2017. “Processing and Properties of Palm Oil-Based Rigid Polyurethane Foam”. Journal of Metals, Materials and Minerals 17 (1). Bangkok, Thailand. https://www.jmmm.material.chula.ac.th/index.php/jmmm/article/view/266.