A Maximum Principle for Elliptic and Parabolic Equations with Oblique Derivative Boundary Problems. Journal of Partial Differential Equations, [S. l.], v. 5, n. 4, p. 23–27, 2020. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/3724. Acesso em: 6 dec. 2025.