%0 Journal Article
%A Billera, Louis J.
%A Liu, Niandong
%T Noncommutative enumeration in graded posets
%J Journal of Algebraic Combinatorics
%D 2000
%P 7-24
%V 12
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JAC_2000__12_1_a6/
%G en
%F JAC_2000__12_1_a6