Xu, Jiafa, Lishan Liu, Shikun Bai, and Yonghong Wu. “Solvability for a System of Hadamard Fractional Multi-Point Boundary Value Problems”. Nonlinear Analysis: Modelling and Control 26, no. 3 (May 1, 2021): 502–521. Accessed May 14, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/22538.