CHEN, Jianqing; PAPAGEORGIOU, Nikolaos S.; ROCHA, Eugénio M. Twin positive solutions for singular nonlinear elliptic equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 35, n. 1, p. 187–201, 2010. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2010.011. Acesso em: 4 jul. 2025.