About: http://webisa.webdatacommons.org/336207209

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	Given the generality with which the question is now phrased, one of the answers you are looking for is (maybe you already thought about it):
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net