%0 Journal Article
%A E. LUKACS
%T Non Negative Definite Solutions of Certain Differential and Functional Equations (Short Communication)
%J Aequationes mathematicae
%D 1969
%P 128-128
%V 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1969__2_182312/
%F AM2_1969__2_182312