%0 Journal Article
%A Thron, R.
%A Koppitz, J.
%T Free systems of algebras and ultraclosed classes.
%J Acta Mathematica Universitatis Comenianae. New Series
%D 2006
%P 127
%V 75
%N 1
%I mathdoc
%U https://geodesic-test.mathdoc.fr/item/AMUC2_2006__75_1_130057/
%G en
%F AMUC2_2006__75_1_130057