Wongsura, Sirisak, and Waree Kongprawechnon. “Discrete-Time Feedback Error Learning and Nonlinear Adaptive Controller”. ECTI Transactions on Electrical Engineering, Electronics, and Communications 6, no. 2 (February 26, 2007): 99–106. accessed April 8, 2025. https://ph02.tci-thaijo.org/index.php/ECTI-EEC/article/view/171769.