%0 Journal Article %A W.A.F. Ruppert %T On group topologies and idempotents in weak almost periodic compactifications. %J Semigroup forum %D 1990 %P 227-238 %V 40 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1990__40_1_135021/ %F SF_1990__40_1_135021