= Bemerkung über die angenäherte Gültigkeit der klassischen Mechanik innerhalb der Quantenmechanik by Paul Ehrenfest
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{tag=Work by Paul Ehrenfest}
{title2=1927}
By <Paul Ehrenfest>. Zeitschrift für Physik 45, 455–457.
https://www.quantum-abc.de/ehrenfest_2.pdf
PDF contains original German appendix, English translation and distinct comments by D. Kriesell. Expectation-value dynamics inspected in translated original. Received date says 5 September 1927; do not repeat unreliable July-date metadata.
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