%0 Journal Article
%A A. I. Tret'yak
%T On~necessary conditions of arbitrary order for optimality in a~time-optimal problem
%J Sbornik. Mathematics
%D 1988
%P 255-268
%V 60
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1988_60_1_a14/
%G en
%F SM_1988_60_1_a14