Institution: | (1) Department of Information Science, Gifu University, Gifu 501-1193, Japan (e-mail: ozawa@info.gifu-u.ac.jp), JP;(2) Department of Mathematics, Keio University, Yokohama 223-8522, Japan (e-mail: jimbo@math.keio.ac.jp), JP;(3) Department of Mathematics, Hiroshima University, Higashi-Hiroshima 739-8524, Japan (e-mail: ksanpei@sed.hiroshima-u.ac.jp), JP;(4) Department of Mathematical and Statistical Methods, Agricultural University of Poznań, Poland (e-mail: smejza@owl.au.poznan.pl), PL |