@article{10_4064_ap_43_3_225_235,
     author = {Bla\.zej Szmanda},
     title = {Oscillation criteria for second order non-linear difference equations},
     journal = {Annales Polonici Mathematici},
     pages = {225--235},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1983},
     doi = {10.4064/ap-43-3-225-235},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-43-3-225-235/}
}