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@article{PORMA_1993__50_2_115814, author = {Yan, Jurang}, title = {Oscillation results for difference equations with delays}, journal = {Portugaliae mathematica}, pages = {129--138}, publisher = {mathdoc}, volume = {50}, number = {2}, year = {1993}, mrnumber = {1244492}, zbl = {0799.39003}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1993__50_2_115814/} }
Yan, Jurang. Oscillation results for difference equations with delays. Portugaliae mathematica, Tome 50 (1993) no. 2, pp. 129-138. http://geodesic.mathdoc.fr/item/PORMA_1993__50_2_115814/