@article{DE_1999_35_6_a10,
     author = {V. V. Pod'yapol'skii and A. L. Skubachevskii},
     title = {Spectral asymptotics of strongly elliptic differential-difference operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {793--800},
     publisher = {mathdoc},
     volume = {35},
     number = {6},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_6_a10/}
}