@article{DAN_1975_225_4_a1,
     author = {O. V. Viskov},
     title = {Operator characterization of generalized {Appell} polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {749--752},
     publisher = {mathdoc},
     volume = {225},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_225_4_a1/}
}