About: http://webisa.webdatacommons.org/289482287

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	For any source other than a point source, interferometrically-designed diffractive element contours are more complicated than ellipses or other conic sections.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr