%0 Journal Article %A Hoehnke, Hans-Jürgen %T Structure of Semigroups %J Canadian journal of mathematics %D 1966 %P 449-491 %V 18 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-048-1/ %R 10.4153/CJM-1966-048-1 %F 10_4153_CJM_1966_048_1