@article{CMUC_2002__43_1_a11,
     author = {Zelen\'y, Miroslav},
     title = {An example of a $\Cal C^{1,1}$ function, which is not a d.c. function},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {149--154},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {2002},
     mrnumber = {1903313},
     zbl = {1090.46012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2002__43_1_a11/}
}