J. A. Ali Al-Hawasy and E. H. Al-Rawdanee, “Numerical Solution for Classical Optimal Control Problem Governing by Hyperbolic Partial Differential Equation via Galerkin Finite Element-Implicit method with Gradient Projection Method”, IHJPAS, vol. 32, no. 2, pp. 71–80, May 2019, doi: 10.30526/32.2.2141.