OPTIMAL NEUMANN BOUNDARY CONTROL OF THE HEAT EQUATION WITH H1 CONTROLS: EXISTENCE, OPTIMALITY CONDITIONS AND STRONG CONVEXITY. JMMCS [Internet]. 2026 Oct. 28 [cited 2026 Oct. 28];132(4):35-53. Available from: https://bm.kaznu.kz/index.php/kaznu/article/view/2014