@article{EJDE_2000__2000__a102,
     author = {Vanegas,  C.J.},
     title = {Nonlinear perturbations of systems of partial differential equations with constant coefficients},
     journal = {Electronic journal of differential equations},
     year = {2000},
     volume = {2000},
     zbl = {0935.35034},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a102/}
}