%0 Journal Article %T Journal of Applied Probability %J Canadian mathematical bulletin %D 1964 %P 338-338 %V 7 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500027363/ %R 10.1017/S0008439500027363 %F 10_1017_S0008439500027363