@article{ZVMMF_1967_7_4_a0,
     author = {G. M. Vainikko},
     title = {Galerkin's perturbation method and the general theory of approximate methods for non-linear equations},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {723--751},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1967_7_4_a0/}
}