<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/08/27/130827170802_element_periodic_table_304x171__nocredit.jpg>
<http://bbchindi.com/hindi/science/2013/08/130830_element_discovery_evidence_an.shtml>