WANG, Lin; ZHANG, Xingqiu; LU, Xinyi. Existence and uniqueness of solutions for a singular system of higher-order nonlinear fractional differential equations with integral boundary conditions. Nonlinear Analysis: Modelling and Control, [S. l.], v. 18, n. 4, p. 493–518, 2013. DOI: 10.15388/NA.18.4.13975. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/13975.. Acesso em: 8 may. 2024.