%0 Journal Article
%A V. A. Lyubishkin
%T On the trace formulas of Gel'fand--Levitan and Krein
%J Sbornik. Mathematics
%D 1993
%P 531-540
%V 74
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1993_74_2_a13/
%G en
%F SM_1993_74_2_a13