%0 Journal Article
%A M. M. Malamud
%T On the Birman problem in the theory of nonnegative symmetric operators with compact inverse
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 2023
%P 111-116
%V 57
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_2023_57_2_a8/
%G ru
%F FAA_2023_57_2_a8