1. Lambeck, K., The Earth’s Variable Rotation, Cambridge: Cambridge University Press, 1980.
2. Zheng, D. W., Yu, N. H., Earth rotation and its relations to geophysical phenomena, Part I; The changes of length of the day, Progress in Geophysics, 1996, 11: 81.
3. Eubanks, T. M., Variations in the orientation of the earth, contributions of space geodesy to geodynamics, Earth Dynamics, Washington: AGU Press, 1993.
4. Liao, D. C., Greiner-Mai, H., A new δLOD series in monthly intervals (1892.0–1997.0) and its comparison with other geophysical results, J. Geodesy., 1999, 73: 466.
5. Hide, R., Dickey, J. O., Earth’s variable rotation, Science, 1991, 253: 629.