%0 Journal Article
%A J.J. Schäffer
%T Linear Differential Equations and Functional Analysis, VIII.
%J Mathematische Annalen
%D 1963
%P 57-100
%V 151
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1963__151_161070/
%F MAN_1963__151_161070