About: http://webisa.webdatacommons.org/209439297

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 referred to? I can not afford investing in books or other publications.
http://www.w3.org/ns/prov#wasQuotedFrom	mathforum.org