GE, B.; RĂDULESCU, V. D.; ZHANG, C. J. Infinitely many positive solutions of fractional boundary value problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 49, n. 2, p. 647–664, 2017. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2017.001. Acesso em: 22 jul. 2024.