University of PittsburghArchiválva 2006. szeptember 16-i dátummal a Wayback Machine-ben. History 1932, Charles Glen King. "In recognition of this medical breakthrough, some scientists believe that King deserved a Nobel Prize." Accessed January 2007
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University of PittsburghArchiválva 2006. szeptember 16-i dátummal a Wayback Machine-ben. History 1932, Charles Glen King. "In recognition of this medical breakthrough, some scientists believe that King deserved a Nobel Prize." Accessed January 2007