@article{BUMI_1966_3_21_4_a5,
     author = {Danese, Arthur E.},
     title = {On a characterization of ultraspherical polynomials.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {368--370},
     publisher = {mathdoc},
     volume = {Ser. 3, 21},
     number = {4},
     year = {1966},
     zbl = {0145.07302},
     mrnumber = {176120},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1966_3_21_4_a5/}
}