%0 Journal Article
%A Z. Polniakowski
%T On the differential equation \(y''-a(x)y =0\)
%J Commentationes Mathematicae
%D 1970
%P  241-248
%V 13
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.14708/cm.v13i2.5676/
%R 10.14708/cm.v13i2.5676
%G pl
%F 10_14708_cm_v13i2_5676