?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=O.A.&rft.aulast=Johnson&rft.au=Johnson%2C+O.A.&rft.pages=45479-45481&rft.atitle=Building+blocks+from+petroleum+sludge%3A+Leachability+and+toxicity+studies&rft.volume=10&rft.issn=09734562&rft.issue=24&rft.date=2015&rft.title=International+Journal+of+Applied+Engineering+Research&rft.genre=article