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 Yoshihara, Kenji (2009)
A Response to Hiroshi Oonishi's 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. 173). (/isis/citation/CBB000933455/) unapi

Article Yoshihara, H. Kenji (2007)
Honorable Professors of Chemistry at Tohoku University a Century Ago (1): Masataka Ogawa and the International Race for the Discovery of New Elements. 化学史研究 [Kagakushi kenkyū; Journal of the Japanese Society for the History of Chemistry] (p. 153). (/isis/citation/CBB000831476/) 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 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 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