@article{CMUC_2012__53_1_a3,
     author = {Zaj{\'\i}\v{c}ek, Lud\v{e}k},
     title = {Singular points of order $k$ of {Clarke} regular and arbitrary functions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {51--63},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {2012},
     mrnumber = {2880910},
     zbl = {1249.49021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2012__53_1_a3/}
}