%0 Journal Article
%A Trlifaj, Jan
%T $E$-rings and differential polynomials over universal fields
%J Commentationes Mathematicae Universitatis Carolinae
%D 1982
%P 159-166
%V 23
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1982__23_1_a12/
%G en
%F CMUC_1982__23_1_a12