@article{DE_1971_7_2_a14,
     author = {V. D. Charushnikov},
     title = {Optimal approximate methods for the solution of linear problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {344--352},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_2_a14/}
}