http://www.encyclopedia.com/topic/Willem_de_Sitter.aspx
http://www.phil-inst.hu/~szekely/PIRT_Budapest/ft/Realdi_ft.pdf
http://www.britannica.com/EBchecked/topic/546850/Willem-de-Sitter
http://www-gap.dcs.st-and.ac.uk/history/Biographies/Sitter.html
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