@article{DE_1989_25_10_a15,
     author = {A. L. Skubachevskii and E. L. Tsvetkov},
     title = {The second boundary value problem for elliptic differential-difference equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1766--1776},
     publisher = {mathdoc},
     volume = {25},
     number = {10},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_10_a15/}
}