1. Abramowitz, M., Stegun, I., 1970: Handbook of Mathematical Functions, Dover Publications, New York.
2. Ashby, N., 1986: Planetary perturbation equations based on relativistic Keplerian motion, in: J. Kovalevsky and V.A. Brumberg (eds.), Relativity in Celestial Mechanics and Astrometry, Springer, Netherlands. Note, the misprint in equation (25).
3. Audoin, C., Guinot, B., 2001: The measurement of time, Cambridge University Press, Cambridge.
4. Azoubib, J., Graveaud, M., Guinot, B., 1977: Estimation of the scale unit duration of time scales, Metrologia 13, pp. 87–93.
5. Bauch, A., Pieter, D., Fujieda, M., Lewandowski, W., 2011, Bureau International des Poids et Mesures, Rapport BIPM-2011/01, Directive for operational use and data handling in two-way satellite and frequency transfer (TWSTFT).