@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042494,
 author = {Nakayama, Yuji and Nishimura, Kiyohiko G.},
 month = {Jan},
 note = {application/pdf, 本文フィルはリンク先を参照のこと},
 title = {Does e-Commerce Always Increase Social Welfare in the Long Run?},
 year = {2002}
}