@article{GAMA_1960_1960_1_a11,
     author = {Echarte Reula, Francisco Javier},
     title = {Las formas diferenciales en la teor{\'\i}a de superficies: f\'ormulas relativas a la torsi\'on geod\'esica.},
     journal = {Gaceta matem\'atica},
     pages = {209-216},
     year = {1960},
     volume = {12},
     number = {7-8},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1960_1960_1_a11/}
}