Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAKAGI Tetsuichi,Present States and Issues on the Development of Rare-Earths Resources,Journal of the Clay Science Society of Japan (in Japanese),04706455,The Clay Science Society of Japan,2012,50,3,123-127,https://cir.nii.ac.jp/crid/1390282679088285440,https://doi.org/10.11362/jcssjnendokagaku.50.3_123