8th Annual report 2001 [documento electrónico] / Belgian Institute of Postal Services and Telecommunications
9th Annual report 2002 / Belgian Institute of Postal Services and Telecommunications
Posts and telecommunications in Japan 2001 : annual report / Ministry of Public Management, Home Affairs, Posts and Telecommunications
Kommunikationsbericht 2004 / Rundfunk & Telekom Regulierungs - GMBH