@article{ZVMMF_1967_7_5_a2,
     author = {G. M. Vainikko},
     title = {On the speed of convergence of approximate methods in the eigenvalue problem},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {977--987},
     publisher = {mathdoc},
     volume = {7},
     number = {5},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1967_7_5_a2/}
}