@article{DAN_1969_184_5_a10,
     author = {A. F. Shapkin},
     title = {Function-class optimal methods of computing eigenvalues of a {Fredholm} integral operator},
     journal = {Doklady Akademii Nauk},
     pages = {1057--1060},
     publisher = {mathdoc},
     volume = {184},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_5_a10/}
}