@article{CMUC_1968_9_3_a2,
     author = {Zizler, V\'aclav E.},
     title = {Banach spaces with the differentiable norms},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {415--440},
     year = {1968},
     volume = {9},
     number = {3},
     mrnumber = {0246121},
     zbl = {0182.45105},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1968_9_3_a2/}
}