著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI)
Elhanan Helpman,"International trade in the presence of product differentiation, economies of scale and monopolistic competition",Journal of International Economics,0022-1996,Elsevier BV,1981-08,11,3,305-340,https://cir.nii.ac.jp/crid/1363670320877475200,https://doi.org/10.1016/0022-1996(81)90001-5