<http://webisa.webdatacommons.org/257359342>	<http://www.w3.org/ns/prov#value>	"Here hv is the photon energy, ?? is the absorption co-efficient, B is a constant related to the material and y is either 2 for a direct transition or ?? for an indirect transition." .
<http://webisa.webdatacommons.org/257359342>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<scielo.org.za> .
<http://webisa.webdatacommons.org/prov/516172229>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/257359342> .
<http://webisa.webdatacommons.org/257359342>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/472385302>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/257359342> .