On the Caputo-Hadamard fractional IVP with variable order using the upper-lower solutions technique - Bouazza, Zoubida; Souhila, Sabit; Etemad, Sina; Souid, Mohammed Said; Akgül, Ali; Rezapour, Shahram; De la Sen, Manuel (AIMS mathematics, 2023)
Keywords: caputo-hadamard fractional derivative; existence results; fractional variable order; upper-lower solutions