@article{DE_1973_9_4_a14,
     author = {T. O. Shaposhnikova},
     title = {Asymptotic estimates of the convergence of the {Ritz} method in the eigenvalue problem for a degenerate elliptic operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {709--716},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_4_a14/}
}