@article{GAMA_1968_1968_1_a2,
     author = {Sainz Eguiz\'abal, \'Alvaro},
     title = {Un sistema de cu\'adricas en relaci\'on con cuestiones de homograf{\'\i}as espaciales.},
     journal = {Gaceta matem\'atica},
     pages = {17-20},
     publisher = {mathdoc},
     volume = {20},
     number = {1-2},
     year = {1968},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1968_1968_1_a2/}
}