About: http://webisa.webdatacommons.org/268682904

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	In mathematics, a period is a number that can be expressed as an integral of an algebraic function over an algebraic domain.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org