@article{PORMA_1959__18_4_114827,
     author = {McCarthy, Paul J.},
     title = {Note on the oscillation of solutions of second order linear difference equations},
     journal = {Portugaliae mathematica},
     pages = {203--205},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1959},
     mrnumber = {0124641},
     zbl = {0094.06102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1959__18_4_114827/}
}