@article{DE_1971_7_11_a14,
     author = {G. A. Il'yushina},
     title = {The generalized principle of localizing spectral decompositions that are connected with the {Beltrami} operator given in an arbitrary $n$-dimensional domain},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2058--2065},
     publisher = {mathdoc},
     volume = {7},
     number = {11},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_11_a14/}
}