@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042578,
 author = {Jean, Cavailhes and Carl, Gaigne and Tabuchi, Takatoshi and Jacques-Francois, Thisse},
 month = {Dec},
 note = {application/pdf, 本文フィルはリンク先を参照のこと},
 title = {Trade and the structure of cities},
 year = {2006}
}