%0 Journal Article
%A A. A. Agrachev
%T Spectrum of the Second Variation
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 2019
%P 32-48
%V 304
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_2019_304_a2/
%G ru
%F TM_2019_304_a2