@article{EXMATH_1999_1999_1_a24,
     author = {Fabi\'an, M. and Zizler, V.},
     title = {Aproximaci\'on elemental a algunas cuestiones sobre suavidad de orden superior en espacios de {Banach.}},
     journal = {Extracta mathematicae},
     pages = {295-327},
     year = {1999},
     volume = {14},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1999_1999_1_a24/}
}