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<http://webisa.webdatacommons.org/317121585>	<http://www.w3.org/ns/prov#value>	"In this technology, a chemical capable of acting as a reducing agent, such as urea, is added before the exhaust reaches the catalyst chamber." .
<http://webisa.webdatacommons.org/prov/89919609>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/317121585> .
<http://webisa.webdatacommons.org/317121585>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .