@article{PORMA_2004__61_3_51565,
     author = {Saker, S.H.},
     title = {Oscillation of third-order difference equations.},
     journal = {Portugaliae mathematica},
     pages = {249--257},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {2004},
     zbl = {1069.39015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2004__61_3_51565/}
}