Khamput, P, and C Kumnuantip. 2008. “Properties of Para-Rubber Plates Using As the Capping on Concrete Specimens for Compression Test Instead of Molten Sulphur”. Journal of Engineering, RMUTT 11 (June):65-70. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242219.