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Yoshihara, H. K. (2004). “Discovery of a new element 'nipponium': re-evaluation of pioneering works of Masataka Ogawa and his son Eijiro Ogawa”. 《Atomic spectroscopy (Spectrochim. Acta, Part B)》 59 (8): 1305–1310. Bibcode:2004AcSpe..59.1305Y. doi:10.1016/j.sab.2003.12.027.
Yoshihara, H. K. (2004). “Discovery of a new element 'nipponium': re-evaluation of pioneering works of Masataka Ogawa and his son Eijiro Ogawa”. 《Atomic spectroscopy (Spectrochim. Acta, Part B)》 59 (8): 1305–1310. Bibcode:2004AcSpe..59.1305Y. doi:10.1016/j.sab.2003.12.027.