%0 Journal Article
%A J.J. Schäffer
%A J.L. MASSERA
%T Linear Differential Equations and Functional Analysis. IV.
%J Mathematische Annalen
%D 1959
%P 287-342
%V 139
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1959__139_160752/
%F MAN_1959__139_160752