PUKALSKYI, I. D. Nonlocal Neumann problem for a degenerate parabolic equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 9, p. 1232–1243, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4719. Acesso em: 5 dec. 2025.