%0 Journal Article
%A D.H. Martin
%T Canonical Variables and Geodesic Fields for the Calculus of Variations of Multiple Integrals in Parametric.
%J Mathematische Zeitschrift
%D 1968
%P 16-27
%V 104
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1968__104_170926/
%F MZ_1968__104_170926