BERRONE, L. R. Resolvent kernels that constitute an approximation of the identity and linear heat-transfer problems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 2, p. 165–182, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4406. Acesso em: 5 dec. 2025.