@article{10_21136_CPM_1979_117999,
     author = {Fabi\'an, Mari\'an J.},
     title = {Concerning a geometrical characterization of {Fr\'echet} differentiability},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {45--64},
     publisher = {mathdoc},
     volume = {104},
     number = {1},
     year = {1979},
     doi = {10.21136/CPM.1979.117999},
     mrnumber = {523572},
     zbl = {0393.46035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1979.117999/}
}