@article{CLTM_1977_1977_1_a2,
     author = {Cerd\'a, Juan and  Cuf{\'\i}, Juli\'an},
     title = {Algunas clases generales de funciones infinitamente diferenciables.},
     journal = {Collectanea mathematica},
     pages = {21-37},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1977},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1977_1977_1_a2/}
}