@techreport{oai:kwansei.repo.nii.ac.jp:00026400,
 author = {藤原, 憲二 and Fujiwara, Kenji},
 issue = {170},
 month = {Jan},
 title = {Trade, Productivity and Welfare when Monopolistic Competition and Oligopoly Coexist},
 year = {2018}
}