@article{EJDE_2014__2014__a80,
     author = {Ioakim,  Xenakis},
     title = {Generalized van der {Pol} equation and {Hilbert's} 16th problem},
     journal = {Electronic journal of differential equations},
     year = {2014},
     volume = {2014},
     zbl = {1309.34046},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a80/}
}