Luangpaiboon, P. “A Study of the Nelder and Mead Modified Simplex Method with the Second-Order Designs on Uni-and Dual- Response Systems”. CURRENT APPLIED SCIENCE AND TECHNOLOGY, vol. 5, no. 1, Nov. 2018, pp. 359-65, https://li01.tci-thaijo.org/index.php/cast/article/view/162342.