Amitabh Basu Pierre Bonami Gérard Cornuéjols François Margot On the relative strength of split, triangle and quadrilateral cuts. 1220-1229 2009 SODA http://doi.acm.org/10.1145/1496770.1496902 conf/soda/2009 db/conf/soda/soda2009.html#BasuBCM09