XU, Jiafa; WEI, Zhongli. Positive solutions for a class of fractional boundary value problems. Nonlinear Analysis: Modelling and Control, [S. l.], v. 21, n. 1, p. 1–17, 2016. DOI: 10.15388/NA.2016.1.1. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/13494.. Acesso em: 18 jul. 2024.