@article{GAMA_1970_1970_1_a5,
     author = {G\'omez S\'anchez, Jes\'us},
     title = {Derivabilidad del m\'odulo de las funciones reales y complejas.},
     journal = {Gaceta matem\'atica},
     pages = {84-92},
     publisher = {mathdoc},
     volume = {22},
     number = {3-4},
     year = {1970},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1970_1970_1_a5/}
}