By means of the recent $ψ$-Hilfer fractional derivative and of the Banach fixed-point theorem, we investigate stabilities of Ulam-Hyers, Ulam-Hyers-Rassias and semi-Ulam-Hyers-Rassias on closed intervals $[a,b]$ and [a,∞) for a particular class of fractional integro-differential equations.
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Sousa et al. (2018) studied this question.