<http://webisa.webdatacommons.org/prov/472385302>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/37447993> .
<http://webisa.webdatacommons.org/37447993>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/37447993>	<http://www.w3.org/ns/prov#value>	"In which h?? is the photon energy, ?? is the absorption coefficient Eg is the absorption band gap and B is a constant relative to the material." .
<http://webisa.webdatacommons.org/37447993>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<nmletters.org> .