Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) 麻生 欣次郎,Coal cleaning course. 2. Physical cleaning. 1. Methods utilizing the difference in specific gravities.,Journal of the Fuel Society of Japan,0369-3775,THE JAPAN INSTITUTE OF ENERGY,1988,67,3,191-198,https://cir.nii.ac.jp/crid/1390001204296850048,https://doi.org/10.3775/jie.67.191