?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.cplett.2023.140721&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=S.F.Z.&rft.au=Mustafa%2C+S.F.Z.&rft.aulast=Mustafa&rft.volume=828&rft.atitle=Modelling+of+similarity+characteristics+of+polycyclic+aromatic+hydrocarbons+(PAHs)+in+Sungai+Perak%2C+Malaysia+via+rough+set+theory+and+principal+component+analysis+(PCA)&rft.title=Chemical+Physics+Letters&rft.date=2023&rft.genre=article