Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) NAKANO Tsukasa and NAKAMURA Ko-ichi and SOMEYA Toshiaki and OHTSUKA Hiroshi,Observation of 3 - dimensional Internal Structure of Rock Using X - ray CT : (1) Density Calibration of CT Value,Geoinformatics,0388502X,Japan Society of Geoinformatics,1997,8,4,239-255,https://cir.nii.ac.jp/crid/1390001204439523200,https://doi.org/10.6010/geoinformatics1990.8.4_239