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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	U.S. Pat. No. 4,081,509 to Hishinuma et al discloses the removal of nitrogen oxide with cobalt complexes containing ligands such as ammine, ethanolamine and histidine and other imidazole derivatives.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com