The Perturbation of the Interface of the Two-dimensional Diffraction Problem and an Approximating Muskat Modal. Journal of Partial Differential Equations, [S. l.], v. 3, n. 2, p. 85–96, 1990. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/3662. Acesso em: 5 dec. 2025.