Kudin, V. F., and S. P. Kolesnichenko. “SUBOPTIMUM NONLINEAR CONTROL BY OPERATION SPEED CRITERION BASED ON BELLMAN-LYAPUNOV METHOD”. Radio Electronics, Computer Science, Control, no. 1 (August 11, 2011). Accessed May 5, 2024. http://ric.zntu.edu.ua/article/view/14446.