Numerical Solutions for the Optimal Control Governing by Variable Coefficients Nonlinear Hyperbolic Boundary Value Problem Using the Gradient Projection, Gradient and Frank Wolfe Methods. Iraqi Journal of Science [Internet]. 2020 May 17 [cited 2024 May 1];:161-9. Available from: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/2133