Berrone, L.R. (2000) “Resolvent kernels that constitute an approximation of the identity and linear heat-transfer problems”, Ukrains’kyi Matematychnyi Zhurnal, 52(2), pp. 165–182. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4406 (Accessed: 5 December 2025).