%0 Journal Article
%A Rojas-Hernández, Reynaldo
%T $\Sigma_s$-products revisited
%J Commentationes Mathematicae Universitatis Carolinae
%D 2015
%P 243-255
%V 56
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.14712/1213-7243.2015.122/
%R 10.14712/1213-7243.2015.122
%G en
%F 10_14712_1213_7243_2015_122