Sombatsompop, Dr. Narongrit. “Comparison of rubber vulcanisate properties filled with carbon black and used flexible polyurethane foams”. Engineering and Applied Science Research 25, no. 3 (February 28, 2013): 27–39. accessed September 27, 2026. https://ph01.tci-thaijo.org/index.php/easr/article/view/6601.