%0 Journal Article
%A Bednařík, Dušan
%A Pastor, Karel
%T A characterization of $C^{1,1}$ functions via lower directional derivatives
%J Mathematica Bohemica
%D 2009
%P 217-221
%V 134
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/MB.2009.140656/
%R 10.21136/MB.2009.140656
%G en
%F 10_21136_MB_2009_140656