1. Andritsanos, V.D., M.G. Sideris, and I.N. Tziavos (2000). A survey of gravity filed modeling applications of the Input-Output system Theory (IOST). Int. Geoid. Serv. Bull., 10, 1–17.
2. Andritsanos, V.D., M.G. Sideris, and I.N. Tziavos (2001). Quasi-stationery Sea Surface topography estimation by the multiple input-output method. J. Geod., 75, 216–226.
3. AVISO User Handbook (1998). Corrected Sea Surface Heights (CORSSHs) AVI-NT-011-311-CN Edition 31.
4. Förste C., F. Flechtner, R. Schmidt, U. Meyer, R Stubenvoll, F. Barthelmes, R. König, K.H. Neumayer, M. Rothacher, Ch. Reigber, R. Biancale, S. Bruinsma, J.M. Lemoine, and J.C. Raimondo (2005). A New High Resolution Global Gravity Field Model Derived from Combination of GRACE and CHAMP Mission and Altimetry/Gravimetry Surface Gravity Data, Poster presented at EGU General Assembly 2005, Vienna, Austria, 24–29, April 2005.
5. Förste, C., R. Schmidt R. Stubenvoll F. Flechtner U. Meyer R. König H. Neumayer R. Biancale S. Lemoine J-M, Bruinsma Loyer S, Barthelmes F, and Esselborn S (2008) The GeoForschungsZentrum Potsdam/Groupe de Recherche de Geodesie Spatiale satellite-only and combined gravity field models: EIGEN-GL04S1 and EIGEN-GL04C. J. Geod., 82(6), 331–346, doi:10.1007/s00190-007-0183-8.