%0 Journal Article
%A S. A. Pak
%T Sign-preserving conditions for the Green's function of a Sturm--Liouville problem
%J Doklady Akademii Nauk
%D 1963
%P 1265-1267
%V 148
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_148_6_a7/
%G ru
%F DAN_1963_148_6_a7