About: http://webisa.webdatacommons.org/186582630

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	You probably will not need a second source, but just in case here is a link
http://www.w3.org/ns/prov#wasQuotedFrom	mathforum.org