@article{CMUC_2010__51_4_a6,
     author = {Koc, Martin and Zaj{\'\i}\v{c}ek, Lud\v{e}k},
     title = {On {Kantorovich's} result on the symmetry of {Dini} derivatives},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {619--629},
     publisher = {mathdoc},
     volume = {51},
     number = {4},
     year = {2010},
     mrnumber = {2858265},
     zbl = {1224.26021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2010__51_4_a6/}
}