In our recent paper1 we failed to cite one important reference of which we were not aware. The fact that the orbits of vectors and are circles and the consequent visual explanation of the two-to-one wobble to spin ratio was published earlier as a letter in Physics Today2 by Andy Ruina.
Also the URL of David J. Morin’s book in Ref. 10 from our paper is cited incorrectly. The correct URL is http://www.courses.fas.harvard.edu/ ̃phys16/Textbook/ch8.pdf.
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