Vlasenko, L. A., and A. M. Samoilenko. “Optimal Control With Impulsive Component for Systems Described by Implicit Parabolic Operator Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 8 (August 25, 2009): 1053–1065. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/3080.