%0 Journal Article
%A E.T. DAVIES
%T A Geometrical Theory of Multiple Integral Problems in the Calculus of Variations
%J Aequationes mathematicae
%D 1971
%P 173-181
%V 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1971__7_136250/
%F AM2_1971__7_136250