Existence and Uniqueness Results for a Pantograph Boundary Value Problem Involving a Variable-Order Hadamard Fractional Derivative. - Kadda Maazouz; Moussa Daif Allah Zaak; Rosana Rodríguez-López (Axioms, 2023)

A Comprehensive Study of the Langevin Boundary Value Problems with Variable Order Fractional Derivatives. - John R. Graef; Kadda Maazouz; Moussa Daif Allah Zaak (Axioms, 2024)