@article{CLTM_1994_1994_1_a6,
     author = {Billeke, Jorge and S\'aez, Eduardo},
     title = {Monotonicidad de la aplicaci\'on peri\'odica de un centro no-hamiltoniano.},
     journal = {Collectanea mathematica},
     pages = {177-182},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1994_1994_1_a6/}
}