%0 Journal Article
%A A. M. Rubinov
%T Necessary conditions for an extremum and their application to the investigation of certain equations
%J Doklady Akademii Nauk
%D 1966
%P 533-535
%V 169
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1966_169_3_a10/
%G ru
%F DAN_1966_169_3_a10