Y. Guo A. Lim B. Rodrigues Y. Zhu Heuristics for a Brokering Set Packing Problem. 2004 ISAIM http://rutcor.rutgers.edu/~amai/aimath04/AcceptedPapers/Guo-aimath04.pdf conf/isaim/2004 db/conf/isaim/isaim2004.html#GuoLRZ04