@article{GAMA_1967_1967_1_a1,
     author = {Cuesta, N.},
     title = {Vector perpendicular a un plano.},
     journal = {Gaceta matem\'atica},
     pages = {11-11},
     publisher = {mathdoc},
     volume = {19},
     number = {1-2},
     year = {1967},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1967_1967_1_a1/}
}