%0 Journal Article
%A K. Yu. Gorbunov
%T There does not exist an enumerable family of context-free grammars that generates the class of single-valued languages
%J Matematičeskie zametki
%D 1991
%P 34-40
%V 50
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1991_50_1_a3/
%G ru
%F MZM_1991_50_1_a3