?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Lei&rft.au=Dong%2C+Lei&rft.aulast=Dong&rft.date=February+2024&rft.title=Nature+Cities&rft.atitle=Defining+a+city+%E2%80%94+delineating+urban+areas+using+cell-phone+data&rft.volume=1&rft.issn=2731-9997&rft.pages=117-125&rft.genre=article