@article{GRSME_2001_2001_1_a7,
     author = {Parrondo, Juan M. R.},
     title = {Juegos de azar parad\'ojicos.},
     journal = {La Gaceta de la Real Sociedad Matem\'atica Espa\~nola},
     pages = {67-77},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2001},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GRSME_2001_2001_1_a7/}
}