@phdthesis{oai:tsukuba.repo.nii.ac.jp:00020888,
 author = {近藤, 昭彦 and Kondoh, Akihiko},
 month = {},
 note = {1984},
 school = {筑波大学, University of Tsukuba},
 title = {Study on the groundwater flow system by environmental tritium in Ichihara region, Chiba prefecture},
 year = {1985}
}