@article{DAN_1965_160_4_a6,
     author = {V. A. Il'in},
     title = {Cesaro, {Riesz,} and {Poisson--Abel} summability of {Fourier} series in the eigenfunctions of the {Laplace} operator},
     journal = {Doklady Akademii Nauk},
     pages = {765--768},
     publisher = {mathdoc},
     volume = {160},
     number = {4},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_160_4_a6/}
}