@article{EJDE_2009__2009__a99,
     author = {Tripathy,  Arun Kumar},
     title = {Oscillation criteria for first-order systems of linear difference equations},
     journal = {Electronic journal of differential equations},
     year = {2009},
     volume = {2009},
     zbl = {1165.39013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a99/}
}