Chantasee, S., and S. Punsomsakul. “Surface Roughness Prediction of SKD11 Steel in CNC Milling Process Using Regression Model”. Asia-Pacific Journal of Science and Technology, vol. 19, no. 6, Apr. 2017, pp. 843-59, https://so01.tci-thaijo.org/index.php/APST/article/view/83067.