%0 Journal Article
%A John de Groot
%T A System of Continuous, Mutually Non-differentiable Functions.
%J Mathematische Zeitschrift
%D 1956
%P 192-194
%V 64
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1956__64_169566/
%F MZ_1956__64_169566