ZHANG, Xingqiu; SHAO, Zhuyan; ZHONG, Qiuyan; ZHAO, Zengqin. Triple positive solutions for semipositone fractional differential equations m-point boundary value problems with singularities and p–q-order derivatives. Nonlinear Analysis: Modelling and Control, [S. l.], v. 23, n. 6, p. 889–903, 2018. DOI: 10.15388/NA.2018.6.5. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/13149.. Acesso em: 25 jul. 2024.