HAO, Zhaocai, GU, Qianqian, SONG, Lu and LIU, Panzhen. Study on the effects of a perturbation parameter on the existence of positive solutions for Hadamard type fractional differential equation. Topological Methods in Nonlinear Analysis. Online. 14 October 2026. pp. 1 - 21. [Accessed 19 October 2026]. DOI 10.12775/TMNA.2025.068.