@article{GAMA_1971_1971_1_a5,
     author = {Vilaplana, J. P.},
     title = {Nota sobre m\'etricas hilbertianas.},
     journal = {Gaceta matem\'atica},
     pages = {83-89},
     publisher = {mathdoc},
     volume = {23},
     number = {3-4},
     year = {1971},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1971_1971_1_a5/}
}