TY - JOUR AU - La Haye, Ross TI - Binary relations on the power set of an $n$-element set JO - Journal of integer sequences PY - 2009 VL - 12 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/JIS_2009__12_2_a3/ LA - en ID - JIS_2009__12_2_a3 ER -