Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) MATSUDA Hideharu and MINATO Susumu,Radioactivities of Rocks in Japan,RADIOISOTOPES,00338303,Japan Radioisotope Association,1999,48,12,760-769,https://cir.nii.ac.jp/crid/1390282679130169856,https://doi.org/10.3769/radioisotopes.48.760