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WikiPedia: Krypton http://encyclopedia.airliquide.com/Encyclopedia.as... http://books.google.com/books?id=ckyqWMwJXJMC&pg=P... http://www.madehow.com/Volume-4/Krypton.html http://www.webelements.com/webelements/elements/te... http://www.journals.uchicago.edu/doi/full/10.1086/... http://math.ucr.edu/home/baez/physics/Relativity/S... http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://catalogue.bnf.fr/ark:/12148/cb119666366 http://data.bnf.fr/ark:/12148/cb119666366 http://www-d0.fnal.gov/hardware/cal/lvps_info/engi...