%0 Journal Article
%A A. A. Agrachev
%T Spectrum of the Second Variation
%J Informatics and Automation
%D 2019
%P 32-48
%V 304
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TRSPY_2019_304_a2/
%G ru
%F TRSPY_2019_304_a2