@article{CMUC_1999__40_1_a3,
     author = {Bartlett, Michael O. and Giles, John R. and Vanderwerff, Jon D.},
     title = {Directional moduli of rotundity and smoothness},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {39--51},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {1999},
     mrnumber = {1715201},
     zbl = {1060.46501},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1999__40_1_a3/}
}