1. IERS Annual Reports. Central Bureau of IERS Observatoire de Paris. ftp://hpiers.obspm.fr/iers/series/opa/eopc04_daily.
2. J. Vondrak, Surv. Geophys. 20, 169 (1999).
3. W. H. Munk and G. J. F. MacDonald, The Rotation of the Earth. A geophysical discussion (Cambridge University Press, New York, 1960).
4. N. S. Sidorenkov, Physics of the Earth’s-Rotation Instabilities (Nauka, Moscow, 2002) [in Russian].
5. H. Moritz and I. Mueller, Earth Rotation: Theory and Observations (Ungar, New York, 1987).