Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yoshii Masahiko,Negotiation of Bulgaria for the EU Accession,国民経済雑誌,03873129,神戸大学経済経営学会,2006-06,193,6,59-71,https://cir.nii.ac.jp/crid/1390290699904219392,https://doi.org/10.24546/00056079