About: http://webisa.webdatacommons.org/142137252

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	Furthermore, the use of incident-light systems, i.e. with an external light source with visible light, makes it difficult to achieve uniformity of the illumination at the same time as continued good contrast.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com