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@article{PORMA_1988__45_1_115614, author = {Taylor, W.E. jr.}, title = {Oscillation properties of fourth order difference equations}, journal = {Portugaliae mathematica}, pages = {105--114}, publisher = {mathdoc}, volume = {45}, number = {1}, year = {1988}, mrnumber = {0952804}, zbl = {0652.39004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1988__45_1_115614/} }
Taylor, W.E. jr. Oscillation properties of fourth order difference equations. Portugaliae mathematica, Tome 45 (1988) no. 1, pp. 105-114. http://geodesic.mathdoc.fr/item/PORMA_1988__45_1_115614/