@article{GRSME_1999_1999_1_a5,
     author = {Cilleruelo, Javier},
     title = {El sistema binario.},
     journal = {La Gaceta de la Real Sociedad Matem\'atica Espa\~nola},
     pages = {157-160},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1999},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GRSME_1999_1999_1_a5/}
}