%0 Journal Article
%A S. Zhang
%T A note on r-extensible prefix codes.
%J Semigroup forum
%D 1989
%P 377-380
%V 39
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1989__39_2_134999/
%F SF_1989__39_2_134999