@article{DAN_1968_181_2_a6,
     author = {L. S. Frank},
     title = {Convolution difference operators},
     journal = {Doklady Akademii Nauk},
     pages = {286--289},
     publisher = {mathdoc},
     volume = {181},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_2_a6/}
}