SukretnaA. V. “Bounded Approximate Synthesis of the Optimal Control for the Wave Equation”. Ukrains’kyi Matematychnyi Zhurnal 59, no. 8 (August 25, 2007): 1094–1104. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3372.