Al-hawasy, Jamil Amir, and Safaa J. Mohammed Al-Qaisi. 2019. “The Continuous Classical Boundary Optimal Control of a Couple Nonlinear Elliptic Partial Differential Equations With State Constraints”. Al-Mustansiriyah Journal of Science 30 (1):143-51. https://doi.org/10.23851/mjs.v30i1.464.