%0 Journal Article
%A U. Hebisch
%T On special Qr-filters of semigroups, semirings and rings.
%J Semigroup forum
%D 1984
%P 195-210
%V 30
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1984__30_134715/
%F SF_1984__30_134715