KEREFOV, A. A. To problems with continual derivative in boundary conditions for a parabolic equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 3, p. 305–313, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4614. Acesso em: 7 apr. 2025.