@article{BUMI_1964_3_19_4_a7,
     author = {Al-Salam, W. A.},
     title = {On a characterization of a certain set of orthogonal polynomials.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {448--450},
     publisher = {mathdoc},
     volume = {Ser. 3, 19},
     number = {4},
     year = {1964},
     zbl = {0142.03602},
     mrnumber = {176120},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1964_3_19_4_a7/}
}