%0 Journal Article
%A L. D. Faddeev
%T An expression for the trace of the difference between two singular differential operators of the Sturm--Liouvilie type
%J Doklady Akademii Nauk
%D 1957
%P 878-881
%V 115
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_115_5_a7/
%G ru
%F DAN_1957_115_5_a7