Sources

http://www.shef.ac.uk/chemistry/web-elements/nofr-define/discovery.html

http://pearl1.lanl.gov/periodic/elements/78.html

http://chemlab.pc.maricopa.edu/periodic/periodic.html

http://www.wedbands.com/

http://www.armak.net/dir.htm

http://www.chemicalelements.com/elements/pt.html

http://tiger.chm.bris.ac.uk/cm1/JonathanT/Welcome.htm

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