@article{TM_1965_84_a6,
     author = {L. N. Dovbysh},
     title = {Stability of {Ritz's} method for problems in the spectral theory of operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {78--92},
     publisher = {mathdoc},
     volume = {84},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1965_84_a6/}
}