@article{PIM_1969_N_S_09_23_a24,
     author = {A. Verma and J. Prasad},
     title = {Characterisation {Of} {Some} {Orthogonal} {Polynomials}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {177 },
     publisher = {mathdoc},
     volume = {_N_S_09},
     number = {23},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/PIM_1969_N_S_09_23_a24/}
}