@article{EJDE_2004__2004__a28,
     author = {Carja, Ovidiu and Necula, Mihai and Vrabie, Ioan I.},
     title = {Local invariance via comparison functions},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2004},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a28/}
}