@article{EJDE_1998__1998__a17,
     author = {Naulin,  Ra\'ul and Vanegas,  Carmen J.},
     title = {Instability of discrete systems},
     journal = {Electronic journal of differential equations},
     year = {1998},
     volume = {1998},
     zbl = {0912.39005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1998__1998__a17/}
}