%0 Journal Article
%A Jürgen Herzog
%T Algebra Retracts and Poincaré-Series.
%J Manuscripta mathematica
%D 1977
%P 307-314
%V 21
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MM2_1977__21_154470/
%F MM2_1977__21_154470