B. Ohji

Nitrate behaviour in the groundwater of a headwater wetland, Chiba, Japan

C. Tang, Y. Sakura, K. Azuma, 2004 .

Radon and Thoron Exposures for Cave Residents in Shanxi and Shaanxi Provinces

S. Akiba, H. Yonehara, S. Tokonami, 2004, Radiation research.