%0 Journal Article %T Corrections %J Canadian mathematical bulletin %D 1972 %P 147-147 %V 15 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-029-0/ %R 10.4153/CMB-1972-029-0 %F 10_4153_CMB_1972_029_0