1. Beutler G (2005) Methods of celestial mechanics. Springer, Berlin Heidelberg New York
2. Beutler G, Brockmann E, Gurtner W, Hugentobler U, Mervart L, Rothacher M, Verdun A (1994) Extended orbit modeling techniques at the CODE processing center of the international GPS service for geodynamics (IGS): theory and initial results. Manuscr Geod 19:367–386
3. Colombo OL (1989) The dynamics of global positioning orbits and the determination of precise ephemerides. J Geophys Res 94(B7):9167–9182
4. Dow JM, Neilan RE, Gendt G (2005) The international GPS service: Celebrating the 10th anniversary and looking to the next decade. ASR 36(3):320–326
5. Hugentobler U, Schaer S, Beutler G, Bock H, Dach R, Jäggi A, Meindl M, Urschl C, Mervart L, Rothacher M, Wild U, Wiget A, Brockmann E, Weber G, Habrich H, Boucher C (2003) In: Gowey K (ed) CODE IGS Analysis Center technical report 2002. IGS Central Bureau, Jet Propulsion Laboratory, Pasadena