%0 Journal Article %T BCM volume 63 Issue 3 Cover and Back matter %J Canadian mathematical bulletin %D 2020 %P b1-b2 %V 63 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000284/ %R 10.4153/S0008439520000284 %F 10_4153_S0008439520000284