Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Okamoto Akira,Introduction of Progressive Expenditure Taxation to Japan,岡山大学経済学会雑誌,0386-3069,岡山大学経済学会,2005-03-10,36,4,193-201,https://cir.nii.ac.jp/crid/1390290699562046080,https://doi.org/10.18926/oer/40545