OstapenkoE. V. “Problem of Optimal Control for a Determinate Equation With Interaction”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 8 (August 25, 2008): 1099–1109. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3227.