@article{DE_1977_13_3_a15,
     author = {J. V. Rybalov},
     title = {Completely continuous imbeddings in weighted classes of functions, and conditions for discreteness of the spectrum of a nonregular elliptic operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {516--528},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_3_a15/}
}