IvanchovN. I. “Inverse Problems for the Heat-Conduction Equation With Nonlocal Boundary Conditions”. Ukrains’kyi Matematychnyi Zhurnal 45, no. 8 (August 25, 1993): 1066–1071. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5901.