1. Guanghua School of Management, Peking Universtiy,Beijing,CHINA,100871
2. The Robert H. Smith School of Business, Universtity of Maryland,Maryland,USA,20742
3. Stony Brook University,Dept. of Applied Mathematics & Statistics,Stony Brook,NY,USA,11794-3600
4. University of Montreal,Dept. of Computer Science & Operations Research,Montreal,Quebec,CANADA
5. Univ Rennes, CNRS, IRISA,INRIA,Rennes Cedex,FRANCE,35042