%0 Journal Article %T BCM volume 62 Issue 4 Cover and Front matter %J Canadian mathematical bulletin %D 2019 %P f1-f2 %V 62 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000584/ %R 10.4153/S0008439519000584 %F 10_4153_S0008439519000584