1. 1)Dansgaard, W., Stable isotopes in precipitation, Tellus, 16, 436-468(1964)
2. 2)Waseda, A. and Nakai, N., Isotopic compositions of meteoric and surface waters in central and northeast Japan, Chikyukagaku, 17, 83-91(1983)(in Japanese with English abstract)
3. Spatial distribution of .DELTA.D-.DELTA.18O values of surface and shallow groundwaters from Japan, south Korea and east China.
4. 4)Agata, S., A geochemical study of the ground waters on Hateruma Island in Okinawa Prefecture, Kougyoyousui(Industrial Water), 418, 15-34(1993)(in Japanese)
5. 5)Agata, S., A geochemical study of surface and ground waters on Yonaguni Island in Okinawa Prefecture, Kougyoyousui(Industrial Water), 446, 34-52(1995)(in Japanese)