?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Pakpahan&rft.au=Pakpahan%2C+E.N.&rft.aufirst=E.N.&rft.issue=6&rft.volume=71&rft.issn=00224456&rft.atitle=Comparison+of+polycyclic+aromatic+hydrocarbons+emission+from+thermal+treatment+of+petroleum+sludge+cake+in+the+presence+of+different+additives&rft.pages=430-436&rft.title=Journal+of+Scientific+and+Industrial+Research&rft.date=2012&rft.genre=article