Naotaka Kajino
Department of Mathematics,
Graduate School of Science,
Kobe University,
Rokkodai-cho 1-1, Nada-ku, 657-8501 Kobe, Japan
Office: Faculty of Science Building B, Room B426
Tel: +81-78-803-5616
Fax: +81-78-803-5610
E-mail: nkajino ``at" math.kobe-u.ac.jp