%0 Journal Article %T CJM volume 71 Issue 6 Cover and Back matter %J Canadian journal of mathematics %D 2019 %P b1-b2 %V 71 %N 6 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008414X1900052X/ %R 10.4153/S0008414X1900052X %F 10_4153_S0008414X1900052X