KOVALEVSKII, A. A. Averaging of the Neumann problems for nonlinear elliptic equations in domains with accumulators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 2, p. 194–212, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5404. Acesso em: 7 apr. 2025.