nutation
1932 / Discovery of the Main Nutation of the Earth's Axis / James Bradley ; George Sarton / Isis 17 (1932) p. 333 [lien]
1970 / The Chandlerian Nutation / R. G. Hipkin / Quarterly Journal of the Royal Astronomical Society 11 (1970) p. 43 [lien]
2011 / Polar motion measurement at the Observatoire de Lyon in the late nineteenth century / Emmanuel Pécontal / Studies in History and Philosophy of Science Part A 42 (2011) p. 94 [doi]