Article Yoshiteru Maeno; Yoji Hisamatsu; Kazuhiro Egashira (2023)
Kenji Yoshihara (1929-2022): Shedding Light on the Work of Masataka Ogawa on His Discovery of the Element "Nipponium." An Obituary-Tribute. Bulletin for the History of Chemistry (pp. 236-241). (/isis/citation/CBB410779174/) unapi

Article Oonishi, Hiroshi (2009)
A Discussion on Ogawa's Discovery of Nipponium in Thorianite. 化学史研究 [Kagakushi kenkyū; Journal of the Japanese Society for the History of Chemistry] (p. 77). (/isis/citation/CBB000933452/) unapi

Article Yoshihara, H. Kenji; Kobayasi, Teiji; Kaji, Masanori (2005)
Ogawa Family and Their “Nipponium” Research: Successful Separation of the Element 75 before Its Discovery by Noddacks. Historia Scientiarum: International Journal of the History of Science Society of Japan (p. 177). (/isis/citation/CBB000670052/) unapi

Article Kaji, Masanori (2003)
Ogawa's Discovery of a New Chemical Element “Nipponium”: The Emergence of Modern Chemistry Research in Japan and Its Social Background. Historia Scientiarum: International Journal of the History of Science Society of Japan (p. 215). (/isis/citation/CBB000470931/) unapi

Article Yoshihara, Kenji (2003)
Masataka Ogawa and His Students at Tohoku University: Research of Platinum Group Elements and X-Ray Spectroscopy. 化学史研究 [Kagakushi kenkyū; Journal of the Japanese Society for the History of Chemistry] (p. 69). (/isis/citation/CBB000770599/) unapi

Article Kaji, Masanori (2002)
Ogawas Entdeckung des “Nipponiums”--Moderne japanische Chemie im historischen Kontext. Mitteilungen der Gesellschaft Deutscher Chemiker, Fachgruppe Geschichte der Chemie (p. 87). (/isis/citation/CBB000203115/) unapi

Article Yoshihara, H. Kenji; Nakai, Izumi; Terada, Yasuo; et al. (2002)
Studies of Nipponium by Masataka Ogawa and His Son Eijiro. 化学史研究 [Kagakushi kenkyū; Journal of the Japanese Society for the History of Chemistry] (p. 209). (/isis/citation/CBB000300352/) unapi

Article Yoshihara, H. Kenji (2000)
Ogawa's discovery of nipponium and its re-evaluation. Historia Scientiarum: International Journal of the History of Science Society of Japan (p. 257). (/isis/citation/CBB000110481/) unapi