@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042225,
 author = {Nagamachi, Kohei},
 month = {Apr},
 note = {application/pdf, 本文フィルはリンク先を参照のこと},
 title = {Task Trade and the Size Distribution of Cities},
 year = {2013}
}