Chomtee, Boonorm. “Comparison of Five Design Variables of Response Surface Designs in a Spherical Region Over a Set of Reduced Models”. Agriculture and Natural Resources 49, no. 2 (April 30, 2015): 305–312. accessed August 27, 2026. https://li01.tci-thaijo.org/index.php/anres/article/view/243573.