Editing Axial precession (section)

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* {{cite journal|first1=J. |last1=Vondrak | first2=N. | last2=Capitaine | first3=P. | last3=Wallace |title= New precession expressions, valid for long time intervals| journal = Astronomy & Astrophysics| year=2011 | volume=534 | page=A22 | doi=10.1051/0004-6361/201117274|bibcode = 2011A&A...534A..22V | doi-access=free }}
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