@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/}
}