@article{CLTM_1975_1975_1_a14,
     author = {Ben{\'\i}tez, Carlos},
     title = {Una propiedad de la ortogonalidad de {Birkhoff} y una caracterizaci\'on de espacios prehilbertianos.},
     journal = {Collectanea mathematica},
     pages = {211-218},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1975},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1975_1975_1_a14/}
}