Lazreg JE, Benchohra M, Salim A. Existence and ulam stability of k-generalized ψ-Hilfer fractional problem . J. Innov. Appl. Math. Comput. Sci [Internet]. 2022 May 7 [cited 2024 Apr. 19];2(2):1-13. Available from: https://jiamcs.centre-univ-mila.dz/index.php/jiamcs/article/view/v2i2_19