KOVALEVSKII, A. A. Averaging of Neumann problems for nonlinear elliptic equations in regions of framework type with thin channels. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 11, p. 1503–1513, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5957. Acesso em: 5 dec. 2025.