9th Annual report 2002 / Belgian Institute of Postal Services and Telecommunications
10th Annual report 2003 [documento electrónico] / Belgian Institute of Postal Services and Telecommunications
Kommunikationsbericht 2004 / Rundfunk & Telekom Regulierungs - GMBH
Kommunikationsbericht 2007 / Rundfunk & Telekom Regulierungs - GMBH