Gérard Cornuéjols Yanjun Li On the Rank of Mixed 0, 1 Polyhedra. 71-77 2001 conf/ipco/2001 IPCO http://link.springer.de/link/service/series/0558/bibs/2081/20810071.htm db/conf/ipco/ipco2001.html#CornuejolsL01