%0 Journal Article
%A Krupka, Demeter
%T Elementary theory of differential invariants
%J Archivum mathematicum
%D 1978
%P 207-214
%V 14
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ARM_1978__14_4_a5/
%G en
%F ARM_1978__14_4_a5