_:vb50849282 . _:vb50849282 . _:vb50849282 "hadPrimarySource property is a particular case of wasDerivedFrom (see http://www.w3.org/TR/prov-dm/#term-original-source) that aims to give credit to the source that originated some information." . _:vb50849282 . _:vb50849282 . _:vb50849282 . _:vb50849282 .