OnhistravelshelearntthatPoincaréhadwrittenapaperonquantumtheorywhichgavesimilarresultstothoseinhisAnnalenderPhysikpaper.PoincaréhadnotknownofEhrenfest'scontributionandthereforehadnotreferredtohiswork.
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On his travels he learnt that Poincaré had written a paper on quantum theory which gave similar results to those in his Annalen der Physik paper. Poincaré had not known of Ehrenfest's contribution and therefore had not referred to his work.