Osamu Hatori＝Jyamira Oppekepenguin

Niigata University, Professor Emeritus

Address: 8050 Igarashi-ni-no-cho, Nishi-ku, Niigata City, Niigata 950-2181, Faculty of Science, Niigata University 

✉     hatori at math.sc.niigata-u.ac.jp

✉     oppekepenguin at gmail.com