Geodesic
On the convergence of difference approximations of the eigenvalues and eigenfunctions of a two-dimensional elliptic operator
Doklady Akademii Nauk, Tome 198 (1971) no. 2, pp. 263-265 
Yu. N. Valitskii. On the convergence of difference approximations of the eigenvalues and eigenfunctions of a two-dimensional elliptic operator. Doklady Akademii Nauk, Tome 198 (1971) no. 2, pp. 263-265. http://geodesic.mathdoc.fr/item/DAN_1971_198_2_a0/
@article{DAN_1971_198_2_a0,
     author = {Yu. N. Valitskii},
     title = {On the convergence of difference approximations of the eigenvalues and eigenfunctions of a two-dimensional elliptic operator},
     journal = {Doklady Akademii Nauk},
     pages = {263--265},
     year = {1971},
     volume = {198},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_198_2_a0/}
}
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