@article{EJDE_1999__1999__a70,
     author = {Toni,  B.},
     title = {Higher order branching of periodic orbits from polynomial isochrones},
     journal = {Electronic journal of differential equations},
     year = {1999},
     volume = {1999},
     zbl = {0929.34031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a70/}
}