<http://webisa.webdatacommons.org/421490094> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.com> . <http://webisa.webdatacommons.org/421490094> <http://www.w3.org/ns/prov#value> "It is therefore necessary to suppress the amount of fluorine atoms bonded in such positions as to hinder the development of the three-dimensional network, thereby avoiding the loss in strength of the skeleton." . <http://webisa.webdatacommons.org/prov/463598354> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/421490094> . <http://webisa.webdatacommons.org/421490094> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> .