1. I. Iwata., The treatment of wastewater at the Ningyo-toge Mine, J. Min. Metallurg. Instit. Jap., 94 (1082), (1978) 247-249 (in Japanese).
2. T. Nagayasu, T. Taki and S. Fukushima, “History and Current Situation of Mine Water Treatment in Ningyo-toge Uranium Mine”, Published by Japan Atomic Energy Agency, Technology, 31 (2016) (in Japanese).
3. T. Muto., Parageneses of the minerals of the ningyo-toge mine., Mineral. J., 3(4) (1961) 195-222.
4. R. Sakao, H. Saito, K, Ukai., Environmental remediation of the mill tailings pond in Ningyo-toge Mine., J. Min. Mater. Process. Institut. Jap., 130 (6) (2014) 275-278 .
5. Published by International Commission on Radiological Protection, The International Commission on Radiological Protection, ICRP Publication 60 (1990).