Hisashi Okada
发表
Yasuhiro Katsuoka,
Hisashi Okada,
Hiroyuki Minami-ashigara-shi Seki,
1996
.
Hisashi Okada,
Naotsune Taga,
Youngcheol Ha,
1992
.
Hisashi Okada,
Morihisa Fujimoto,
1976
.
Hisashi Okada,
Young-Cheol Ha,
Young-Cheol Ha,
1992
.