@article{ZVMMF_1971_11_5_a22,
     author = {S. K. Godunov},
     title = {The use of energy integrals for estimating the accuracy of approximate eigenvalues},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1322--1326},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1971_11_5_a22/}
}