<http://webisa.webdatacommons.org/prov/214985680>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/308556694> .
<http://webisa.webdatacommons.org/308556694>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.ca> .
<http://webisa.webdatacommons.org/308556694>	<http://www.w3.org/ns/prov#value>	"In a conventional etalon, two parallel reflecting mirrors are separated by a gap, typically filled with a medium such as air or gas, with length d." .
<http://webisa.webdatacommons.org/prov/214905391>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/308556694> .
<http://webisa.webdatacommons.org/308556694>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .