@techreport{oai:kwansei.repo.nii.ac.jp:00028218,
 author = {新海, 哲哉 and 北村, 亮真 and Shinkai, Tetsuya and Kitamura, Ryoma},
 issue = {197},
 month = {Sep},
 title = {Production Substitution of Goods Within and Between Firms in a Multiproduct Duopoly},
 year = {2019}
}