Atsumi Ogata

Argon isotope analysis by a newly developed mass spectrometric system for K-Ar dating.

K. Nagao, T. Itaya, K. Inoue, 1991 .

Noble Gases and 81Kr Terrestrial Ages of Antarctic Eucrites

K. Nagao, Atsumi Ogata, 1989 .

Ar Isotope Analysis for K-Ar Dating Using Two Modified-VG5400 Mass Spectrometers-I : Isotope Dilution Method

Y. Miura, K. Nagao, K. Yamaguchi, 1996 .

Highly reproducible 13 and 17ka K-Ar ages of two volcanic rocks.

Y. Miura, K. Nagao, J. Matsuda, 1991 .