@article{EJDE_2011__2011__a96,
     author = {Da Cunha,  Warley Ferreira and Dias,  Fabio Scalco and Mello,  Luis Fernando},
     title = {Centers on center manifolds in a quadratic system obtained froma scalar third-order differential equation},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1235.34095},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a96/}
}