%0 Journal Article
%A E.J. Wilczynski
%T A fundamental theorem in the theory of ruled surfaces
%J Mathematische Annalen
%D 1904
%P 249-256
%V 58
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1904__58_158123/
%F MAN_1904__58_158123