About: http://webisa.webdatacommons.org/193211769

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The angles of illumination and viewing are critical as paper surfaces are not ideal diffusers, and the numerical values obtained are a function of the particular geometry employed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es