Contact Address

Takayuki Kobayashi
Department of Mathematics, Faculty of Science and Engineering, Saga University
Sagashi Honjyouchou 1, 840-8502, Japan,
e-mail: kobayasi (at) ms.saga-u.ac.jp

Hai-Liang Li
School of Mathematics, Capital Normal University
Beijing 100037, P.R. China,
e-mail: hailiang.li.math (at) gmail.com

Please replace "(at)" with "@" in the above e-mail addresses.