%0 Journal Article
%A Abrhan, Imrich
%A Satko, Ladislav
%T $r$-systems of unary algebras. I: On maximal and greatest $J$-classes of the direct product of unary algebras
%J Mathematica slovaca
%D 1994
%P 55-68
%V 44
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MASLO_1994__44_1_a5/
%G en
%F MASLO_1994__44_1_a5