?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=I+S&rft.au=Olawumi%2C+I+S&rft.aulast=Olawumi&rft.atitle=The+economic+cost+of+air+pollution+in+Mangaung+metro+municipality%3A+A+case+study+in+South+Africa&rft.title=African+Journal+of+Environmental+Science+and+Technology+&rft.issn=1996-0786+&rft.date=2013&rft.volume=7&rft.pages=718-724&rft.issue=7&rft.genre=article