@article{DE_1968_4_3_a11,
     author = {A. L. Teptin},
     title = {On the question of the applicability of the maximum principle to an elliptic difference equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {508--517},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_3_a11/}
}