%0 Journal Article %A Rider, Daniel %T Central Idempotent Measures on Unitary Groups %J Canadian journal of mathematics %D 1970 %P 719-725 %V 22 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-082-5/ %R 10.4153/CJM-1970-082-5 %F 10_4153_CJM_1970_082_5