WANG, Hui; ZHANG, Lingling; WANG, Xiaoqiang. New unique existence criteria for higher-order nonlinear singular fractional differential equations. Nonlinear Analysis: Modelling and Control, [S. l.], v. 24, n. 1, p. 95–120, 2018. DOI: 10.15388/NA.2019.1.6. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/12920. Acesso em: 28 apr. 2025.