Luca, Rodica. “Positive Solutions for a System of Fractional Differential Equations With P-Laplacian Operator and Multi-Point Boundary Conditions”. Nonlinear Analysis: Modelling and Control 23, no. 5 (October 22, 2018): 771–801. Accessed May 15, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/13163.