SHAN, Y.; LI, K. Index theory for linear elliptic equation and multiple solutions for asymptotically linear elliptic equation with resonance. Topological Methods in Nonlinear Analysis, [S. l.], v. 44, n. 1, p. 89–104, 2016. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2014.037. Acesso em: 27 apr. 2024.