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Junichi Hirukawa
Department of Mathematics, Faculty of Science, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata City, Niigata 950-2181, Japan.
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Hiroyuki Taniai
School of International Liberal Studies, Waseda University, 1-6-1 Nishi-Waseda, Shinjuku-ku, Tokyo 169-8050, Japan.
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Marc Hallin
Institut de Recherche en Statistique, ECARES, Université libre de Bruxelles, CP 114, B-1050, Bruxelles, Belgium, ORFE, Princeton University, CentER, University of Tilburg, and ECORE.
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Masanobu Taniguchi
Department of Applied Mathematics, School of Fundamental Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.