@article{PORMA_1971__30_1_115131,
     author = {Joshi, C.M.},
     title = {An operational formula involving the associated ultraspherical polynomials},
     journal = {Portugaliae mathematica},
     pages = {1--9},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1971},
     mrnumber = {0304728},
     zbl = {0223.33014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115131/}
}