KapustyanO. V., and SukretnaA. V. “Averaged Synthesis of the Optimal Control for a Wave Equation”. Ukrains’kyi Matematychnyi Zhurnal 55, no. 5 (May 25, 2003): 612-620. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3937.