1. Anderle, R.J.: Polar motion determinations by U.S. Navy Doppler satellite observations. NWL Technical Report T.R.2432, 1970
2. Brouwer, D.: A study of the changes in the rate of rotation of the Earth. Astron. J. 57, 125–146 (1952)
3. Capitaine, N., Feissel, M.: L’introduction des coordonnées du pôle déduites de l’observation Doppler de satellite dans les calculs du Bureau International de l’Heure. In: Proceedings International Meeting on “Earth’s Rotation by Satellite Observations”. Cagliari, 1973. Proverbio, E. (ed.). Bologna: Graficoop, 1974, pp. 65–73
4. Feissel, M.: The determination of UT1 by the Bureau International de l’Heure. In: Proceedings 8th Annual Precise Time and Time Interval Applications and Planning Meeting, Washington, 1976, pp. 47-65
5. Guinot, B.: A determination of the Love Number k from the periodic waves of UT1. Astron. Astrophys. 36, 1–4 (1974)