<http://webisa.webdatacommons.org/97571320>	<http://www.w3.org/ns/prov#value>	"special grating made of a heavy metal such as tungsten shifts the frequency" .
<http://webisa.webdatacommons.org/97571320>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<aapm.org> .
<http://webisa.webdatacommons.org/97571320>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/358765998>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/97571320> .