%0 Journal Article
%A Pilecka-Oborska, Barbara
%A Serafin, Stanisław
%T On $x$-operators in an arbitrary semigroup
%J Archivum mathematicum
%D 1985
%P 13-22
%V 21
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ARM_1985__21_1_a2/
%G en
%F ARM_1985__21_1_a2