About: http://webisa.webdatacommons.org/447496451

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	But the simple claim that they are ???intractable??? is one that the authors, I am sure, would agree is a claim that needs to be carefully checked.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com