Akinari Hoshi
Professor of Niigata University,
Department of Mathematics,
Chair, Mathematical Science, Fundamental Sciences, Graduate School of Science and Technology
Vice Chair, Advanced Materials and Fundamental Sciences Program, Graduate School of Integrated Arts and Sciences
Department of Mathematics, Faculty of Science, Niigata University
8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan
e-mail : hoshi +@+ math.sc.niigata-u.ac.jp (Please replace "+@+" to "@".)