Contact information of Hiraku Nozawa
Address:
Department of Mathematical Sciences,
Colleges of Science and Engineering, Ritsumeikan University,
1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577, Japan.
E-Mail address:
×××××××@fc.ritsumei.ac.jp
(replace ××××××× with hnozawa)