@article{GRSME_2001_2001_1_a11,
     author = {Bruno, Alicia},
     title = {La ense\~nanza de los numeros negativos: formalismo y significado.},
     journal = {La Gaceta de la Real Sociedad Matem\'atica Espa\~nola},
     pages = {415-427},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2001},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GRSME_2001_2001_1_a11/}
}