%0 Journal Article
%A S. P. Shishatskii
%T The correctness of boundary problems for a second-order differential equation with a self-adjoint negative operator in a Hilbert space
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 1968
%P 81-85
%V 2
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_1968_2_2_a8/
%G ru
%F FAA_1968_2_2_a8