@article{DE_1967_3_8_a16,
     author = {Yu. N. Sudarev},
     title = {The asymptotic distribution of the eigenvalues of elliptic operators in $n$-dimensional space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1364--1374},
     publisher = {mathdoc},
     volume = {3},
     number = {8},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_8_a16/}
}