%0 Journal Article
%A M. G. Tagiev
%T A~necessary and sufficient condition for a~strong extremum in~a~degenerate problem of~the~calculus of~variations
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1979
%P 187-188
%V 34
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1979_34_4_a24/
%G en
%F RM_1979_34_4_a24