@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042581,
 author = {Khan, Haider A.},
 month = {Dec},
 note = {application/pdf, 本文フィルはリンク先を参照のこと},
 title = {Soft Infrastructure, Trading Costs and Regional Co-operation},
 year = {2006}
}