@article{GRSME_2008_2008_1_a18,
     author = {Recio, Tom\'as},
     title = {Competencia obligatoria.},
     journal = {La Gaceta de la Real Sociedad Matem\'atica Espa\~nola},
     pages = {559-571},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2008},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GRSME_2008_2008_1_a18/}
}