@article{GAMA_1969_1969_1_a3,
     author = {Casal Piga, Alfonso and  Guerrero Fern\'andez, Antonio and  Guerrero Fern\'andez, Mario},
     title = {Sobre espacios vectoriales en dualidad.},
     journal = {Gaceta matem\'atica},
     pages = {59-61},
     publisher = {mathdoc},
     volume = {21},
     number = {3-4},
     year = {1969},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1969_1969_1_a3/}
}