%0 Journal Article
%A Shephard, G. C.
%T An Elementary Proof of Gram's Theorem for Convex Polytopes
%J Canadian journal of mathematics
%D 1967
%P 1214-1217
%V 19
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-110-7/
%R 10.4153/CJM-1967-110-7
%F 10_4153_CJM_1967_110_7