Existence of weak solutions for a nonlinear parabolic equations by Topological degree. Advances in the Theory of Nonlinear Analysis and its Application, [S. l.], v. 4, n. 4, p. 292–298, 2023. Disponível em: https://atnaea.org/index.php/journal/article/view/131.. Acesso em: 2 apr. 2026.