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vol59no4p57_62.pdf
vol59no4p57_62.pdf
http://www.lorentz.leidenuniv.nl/history/einstein/vol59no4p57_62.pdf
Paul Ehrenfest
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vol59no4p57_62.pdf
http://www.lorentz.leidenuniv.nl/history/einstein/vol59no4p57_62.pdf