@article{EJDE_2001__2001__a39,
     author = {Shen,  Jianhua and Stavroulakis,  I.P.},
     title = {Oscillation criteria for delay difference equations},
     journal = {Electronic journal of differential equations},
     year = {2001},
     volume = {2001},
     zbl = {0964.39009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a39/}
}