Counting Partial Orders With A Fixed Number Of Comparable Pairs.

Hans Jürgen Prömel Angelika Steger Anusch Taraz Counting Partial Orders With A Fixed Number Of Comparable Pairs. 2001 10 Combinatorics, Probability & Computing 2 db/journals/cpc/cpc10.html#PromelST01 http://dx.doi.org/10.1017/S0963548301004503 159-177