%0 Journal Article %T Ontario Mathematical Meetings %J Canadian mathematical bulletin %D 1967 %P 127-130 %V 10 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500027636/ %R 10.1017/S0008439500027636 %F 10_1017_S0008439500027636