?url_ver=Z39.88-2004&rft_id=10.1068%2Fa070743&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Swain%2C+H.&rft.aulast=Swain&rft.aufirst=H.&rft.issue=7&rft.volume=7&rft.date=1975&rft.issn=0308-518X&rft.atitle=Urban+Systems%3A+A+Policy+Perspective&rft.title=Environment+and+Planning+A&rft.pages=743-755&rft.genre=article