BARTSCH, T.; WETH, T. The effect of the domain’s configuration space on the number of nodal solutions of singularly perturbed elliptic equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 26, n. 1, p. 109–133, 2005. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2005.027. Acesso em: 22 jul. 2024.