“The Continuous Classical Boundary Optimal Control Vector Governing by Triple Linear Partial Differential Equations of Parabolic Type”. Ibn AL-Haitham Journal For Pure and Applied Sciences 33, no. 3 (July 20, 2020): 113–126. Accessed May 7, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/2478.