%0 Journal Article
%A A. Yu. Levin
%T Integral criteria for the equation $\ddot x+q(t)x=0$ to be nonoscillatory
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1965
%V 20
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1965_20_2_a21/
%G ru
%F RM_1965_20_2_a21