@article{UMJ_2020_6_2_a1,
     author = {Baghdadi Aloui and Jihad Souissi},
     title = {Hahn's problem with respect to some perturbations of the raising operator $(X-c)$},
     journal = {Ural mathematical journal},
     pages = {15--24},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UMJ_2020_6_2_a1/}
}