%0 Journal Article %T CJM volume 71 Issue 2 Cover and Back matter %J Canadian journal of mathematics %D 2019 %P b1-b2 %V 71 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008414X19000105/ %R 10.4153/S0008414X19000105 %F 10_4153_S0008414X19000105