V. N. Pavlenko, “Control of singular distributed parabolic systems with discontinuous nonlinearities”, Ukr. Mat. Zhurn., vol. 46, no. 6, pp. 729–736, Jun. 1994, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5700