1. D.D. McCarthy, K.P. Seidelmann: Time: From Earth Rotation to Atomic Physics (Wiley-VCH, Weinheim 2009)
2. K. Lambeck: Geophysical Geodesy, The Slow Deformations of the Earth (Clarendon, Oxford 1988)
3. NIST SP 330,2008
4. SI Brochure: The International System of Units (SI), 8th edn. (Bureau International des Poids et Mesures, Paris 2006)
5. P.K. Seidelmann: Explanatory Supplement to the Astronomical Almanac (Univ. Science Books, Mill Valley 1992)