Kapustyan, O. A. “Approximate Synthesis of Optimal Bounded Control for a Parabolic Boundary-Value Problem”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 12 (December 25, 2002): 1704-1709. Accessed May 12, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4210.