%0 Journal Article
%A John Milnor
%T On the existence of a connection with curvature zero.
%J Commentarii mathematici Helvetici
%D 1957
%P 215-223
%V 32
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1957__32_139154/
%F CMH_1957__32_139154