D. Behrend, W. Schlüter, H. Schuh:
"International VLBI Service for Geodesy and Astrometry (IVS)";
in: "International Association of Geodesy - Travaux 2007", IAG (International Association of Geodesy), 2007, 7 pages.
http://www.iag-aig.org/attach/9316bd52b9894897de444a340660ae5f/ivs.pdf