%0 Journal Article
%A A. A. Agrachev
%T On the space of symmetric operators with multiple ground states
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 2011
%P 1-15
%V 45
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_2011_45_4_a0/
%G ru
%F FAA_2011_45_4_a0