About: http://webisa.webdatacommons.org/193604779

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 problem of unwanted, i.e. junk, e-mail is well known and has received considerable attention.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr