Al-Hawasy, jamil Amir, and Wissam A. Abdul-Hussien Al-Anbaki. “The Classical Continuous Optimal Control for Quaternary Nonlinear Parabolic Boundary Value Problems With State Vector Constraints”. Ibn AL-Haitham Journal For Pure and Applied Sciences, vol. 35, no. 3, July 2022, pp. 135-4, https://doi.org/10.30526/35.3.2816.