%0 Journal Article
%A Christian Berg
%A Zoltán Sasvári
%T Functions with a Finite Number of Negative Squares on Semigroups.
%J Monatshefte für Mathematik
%D 1989
%P 9-34
%V 107
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MOMA_1989__107_3_178410/
%F MOMA_1989__107_3_178410