On the question of the sign of the Green's function of a difference problem with combined boundary value conditions
Differencialʹnye uravneniâ, Tome 7 (1971) no. 8, pp. 1368-1376.

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     author = {V. Ya. Derr},
     title = {On the question of the sign of the {Green's} function of a difference problem with combined boundary value conditions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1368--1376},
     publisher = {mathdoc},
     volume = {7},
     number = {8},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_8_a2/}
}
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V. Ya. Derr. On the question of the sign of the Green's function of a difference problem with combined boundary value conditions. Differencialʹnye uravneniâ, Tome 7 (1971) no. 8, pp. 1368-1376. http://geodesic.mathdoc.fr/item/DE_1971_7_8_a2/