TY - JOUR AU - Garrione, Maurizio TI - A note on a nonresonance condition at zero for first-order planar systems JO - Electronic journal of differential equations PY - 2015 VL - 2015 UR - http://geodesic.mathdoc.fr/item/EJDE_2015__2015__a16/ LA - en ID - EJDE_2015__2015__a16 ER -