@article{DE_1989_25_10_a28,
     author = {V. G. Prikazchikov},
     title = {Efficient improvement of the accuracy of calculating eigenvalues},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1821--1823},
     publisher = {mathdoc},
     volume = {25},
     number = {10},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_10_a28/}
}