%0 Journal Article
%A Durdil, Jiří
%T On the geometric characterization of differentiability. I.
%J Commentationes Mathematicae Universitatis Carolinae
%D 1974
%P 521-540
%V 15
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1974__15_3_a10/
%G en
%F CMUC_1974__15_3_a10