%0 Journal Article
%T P 12.
%J Canadian mathematical bulletin
%D 1959
%P 43-43
%V 2
%N 1
%U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500024875/
%R 10.1017/S0008439500024875
%F 10_1017_S0008439500024875