<http://webisa.webdatacommons.org/prov/387627508>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/219825097> .
<http://webisa.webdatacommons.org/219825097>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/219825097>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/219825097>	<http://www.w3.org/ns/prov#value>	"As a method for calculating the radius of the grating rings, methods such as using the high imaginary refractive index and other methods are well known." .