Saikaew, Charnnarong, Rangsrit Sootticoon, Anurat Wisitsoraat, and Sujin Bureerat. 2017. “Quality improvement of thin film coating process by applying experimental design (Thai)”. Asia-Pacific Journal of Science and Technology 14 (9):849-60. https://so01.tci-thaijo.org/index.php/APST/article/view/83540.