%0 Journal Article
%A F. Clarke
%T Extremal arcs and extended Hamiltonian systems
%J Differencialʹnye uravneniâ
%D 1977
%P 427-442
%V 13
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_3_a4/
%G ru
%F DE_1977_13_3_a4