Itik, Mehmet. “Optimal Control of Nonlinear Systems With Input Constraints Using Linear Time Varying Approximations”. Nonlinear Analysis: Modelling and Control 21, no. 3 (May 20, 2016): 400–412. Accessed May 3, 2025. https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/13477.