%0 Journal Article %T Ontario Mathematical Meetings %J Canadian mathematical bulletin %D 1967 %P 131-136 %V 10 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500027648/ %R 10.1017/S0008439500027648 %F 10_1017_S0008439500027648