%0 Journal Article
%A G.E. BREDON
%A J.W. WOOD
%T Non-Orientable Surfaces in Orientable 3-Manifolds.
%J Inventiones mathematicae
%D 1969
%P 83-110
%V 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1969__7_141954/
%F IM_1969__7_141954