About: http://webisa.webdatacommons.org/75896489

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	They mention all the important issues, except maybe for the selection bias mentioned below.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.co.uk