BUHRII, O. M.; LAVRENYUK, S. P. On a Parabolic Variational Inequality That Generalizes the Equation of Polytropic Filtration. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 7, p. 867–878, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4308. Acesso em: 11 apr. 2025.