HENDERSON, Johnny; LUCA, Rodica. Existence of positive solutions for a singular fractional boundary value problem. Nonlinear Analysis: Modelling and Control, [S. l.], v. 22, n. 1, p. 99–114, 2017. DOI: 10.15388/NA.2017.1.7. Disponível em: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/13412. Acesso em: 27 apr. 2025.