TY - JOUR AU - Da Cunha, Warley Ferreira AU - Dias, Fabio Scalco AU - Mello, Luis Fernando TI - Centers on center manifolds in a quadratic system obtained froma scalar third-order differential equation JO - Electronic Journal of Differential Equations PY - 2011 VL - 2011 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a96/ LA - en ID - EJDE_2011__2011__a96 ER -