On a dentition of giant extinct shark, Carcharodon megalodon, from Annaka City, Gumma Prefecture, Japan (Preliminary report). [in Japanese] Journal of the Geological Society of Japan, 89(10), 597–598
On the teeth of the Genus Isurus from Tomioka City, Gumma Prefecture, Japan (Preliminary Report) [in Japanese]. Journal of the Geological Society of Japan, 84(5), 271–272