Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ohkawa Tihiro,Prevention of impurity accumulation in classical tokamaks.,Kakuyūgō kenkyū,04512375,The Japan Society of Plasma Science and Nuclear Fusion Research,1985,53,2,161-168,https://cir.nii.ac.jp/crid/1390001206512296064,https://doi.org/10.1585/jspf1958.53.161