(1)
Zhang, X.; Kong, D.; Tian, H.; Wu, Y.; Wiwatanapataphee, B. An Upper-Lower Solution Method for the Eigenvalue Problem of Hadamard-Type Singular Fractional Differential Equation. NAMC 2022, 27 (4), 789-802. https://doi.org/10.15388/namc.2022.27.27491.