Sawaraj, Sunanta, Khwunta Khawmee, Vatcharee Seechamnanturakiy, Chakkrit Poonpakdee, and Jumpen Onthong. 2021. “Development and Validation of Inorganic Phosphorus Test Kit in Rubber Latex”. YRU Journal of Science and Technology 7 (1). Yala, Thailand:29-37. https://li01.tci-thaijo.org/index.php/yru_jst/article/view/248122.