@article{GRSME_2002_2002_1_a7,
     author = {Fern\'andez Lajusticia, Alejandro and  Puig, Luis },
     title = {An\'alisis fenomenol\'ogico de los conceptos de raz\'on, proporci\'on y proporcionalidad.},
     journal = {La Gaceta de la Real Sociedad Matem\'atica Espa\~nola},
     pages = {397-416},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {2002},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GRSME_2002_2002_1_a7/}
}