About: http://webisa.webdatacommons.org/235117327

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	It is therefore desirable, in the half-transparent mirror arrays 20 of such structures as depicted in FIGS. 4 and 5, that the angle ?? be smaller than 40 degrees in practice.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com