Institution: | (1) Department of Management Sciences, Science University of Tokyo, Kagurazaka 1-3, Shinjuku-ku, Tokyo, Japan;(2) RWTH Aachen, Lehrstuhl C für Mathematik, Templergraben 55, D-52062 Aachen, Germany;(3) Department of Systems Science, Tokyo Institute of Technology, Oh-okayama 2-12-1, Meguro-ku, Tokyo, Japan |