@article{GRSME_2004_2004_1_a0,
     author = {Ca\~nada, A. and  Villegas, S.},
     title = {{\textquestiondown}El teorema de {Bolzano} en varias variables?},
     journal = {La Gaceta de la Real Sociedad Matem\'atica Espa\~nola},
     pages = {101-121},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2004},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GRSME_2004_2004_1_a0/}
}