%0 Journal Article %T CJM volume 72 Issue 2 Cover and Back matter %J Canadian journal of mathematics %D 2020 %P b1-b2 %V 72 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008414X20000188/ %R 10.4153/S0008414X20000188 %F 10_4153_S0008414X20000188