Wang, JinRong, Yong Zhou, and Milan Medveď. “Existence and Stability of Fractional Differential Equations With Hadamard Derivative”. Topological Methods in Nonlinear Analysis 41, no. 1 (April 22, 2013): 113–133. Accessed April 27, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2013.005.