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National Science Foundation – The President's National Medal of Science: Recipient Details: RUDOLF E. KÁLMÁN
web.archive.org
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whitehouse.gov
THE WHITE HOUSE
OFFICE OF THE PRESS SECRETARY. Remarks by the President at the National Medal of Science and National Medal of Technology and Innovation Ceremony [online]. web.archive.org/web/20160310020815/, [cit. 2019-11-30]. Dostupné online. Archivované 2016-03-10 z originálu.