@article{EXMATH_2001_2001_1_a32,
     author = {Li, Chengzhi and Li, Weigu and Llibre, Jaume and Zhang, Zhifen},
     title = {Sistemas polin\'omicos: una cota inferior para la formulaci\'on d\'ebil del problema 16 de {Hilbert.}},
     journal = {Extracta mathematicae},
     pages = {441-447},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_2001_2001_1_a32/}
}