@techreport{oai:tsukuba.repo.nii.ac.jp:00033789,
 author = {HIRAOKA, Noriyuki and OTA, Mitsuru and 太田, 充 and TURNBULL, Stephen J.},
 month = {May},
 title = {Relationship between urban population growth and utility level of workers with heterogeneity of labor efficiency},
 year = {2015}
}