@techreport{oai:kwansei.repo.nii.ac.jp:00019439,
 author = {Kitamura, Ryoma and 新海, 哲哉 and Kitamura, Ryoma and Shinkai, Tetsuya},
 issue = {113},
 month = {Jan},
 title = {Cannibalization may Allow a Cost-inefficient Firm to Earn more than a Cost-effcient Firm in a Duopoly with Two Vertically Differentiated Goods},
 year = {2014}
}