@article{EJDE_2015__2015__a16,
     author = {Garrione, Maurizio},
     title = {A note on a nonresonance condition at zero for first-order planar systems},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2015},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2015__2015__a16/}
}