Punyanitya, S., R. Koonawut, and T. Sirisoam. “Developing on Implant Biorubber Materials Without Using Acid for Coagulation”. Greater Mekong Subregion Medical Journal, vol. 1, no. 3, Aug. 2021, pp. 145-9, https://he02.tci-thaijo.org/index.php/gmsmj/article/view/253088.