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Ogata Kōan Tham khảoLiên quan
Ogata Kōan Ogata Sadako Ogata Mitsuhiko Ogata Satoru Ogawa Koki (cầu thủ bóng đá) Ogawa Yudai Ogawa Kiyoshi Ogawa Yoshizumi Ogawa Ryoya Ogasawara, TokyoTài liệu tham khảo
WikiPedia: Ogata Kōan http://data.bibliotheken.nl/id/thes/p316000655 https://www.idref.fr/11901937X https://id.loc.gov/authorities/names/n81041666 https://ci.nii.ac.jp/author/DA01674564?l=en https://id.ndl.go.jp/auth/ndlna/00271281 https://web.archive.org/web/20090302001539/http://... https://isni.org/isni/0000000082555456 https://viaf.org/viaf/67783141 https://www.wikidata.org/wiki/Q1187045#identifiers https://commons.wikimedia.org/wiki/Category:Ogata_...