Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) "YOSHIDA, Fumikazu",Geo-Pollution and A Clean-Up System,ECONOMIC JOURNAL OF HOKKAIDO UNIVERSITY,0916-4650,FACULTY OF ECONOMICS Hokkaido University,1996,25,,61-82,https://cir.nii.ac.jp/crid/1050564288947282304,