TY - JOUR AU - Baghdadi Aloui AU - Jihad Souissi TI - Hahn's problem with respect to some perturbations of the raising operator $(X-c)$ JO - Ural mathematical journal PY - 2020 SP - 15 EP - 24 VL - 6 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/UMJ_2020_6_2_a1/ LA - en ID - UMJ_2020_6_2_a1 ER -