%0 Journal Article
%A Baayen, Cor P.
%A Hedrlín, Zdeněk
%T On the product and sum of a system of transformation semigroups
%J Commentationes Mathematicae Universitatis Carolinae
%D 1963
%P 29-42
%V 04
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1963__4_1_a3/
%G en
%F CMUC_1963__4_1_a3