%0 Journal Article
%A John Hempel
%T Orientation Reversing Involutions and the First Betti Number for Finite Coverings of 3-Manifolds.
%J Inventiones mathematicae
%D 1982
%P 133-142
%V 67
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1982__67_142904/
%F IM_1982__67_142904