1. El Mundo (2008). Economía y Empresas, p. 8, 7/Sept.
2. UMTS Forum. (2005). Magic mobile future 2010–2020; Report No. 37 from The Umts Forum.
3. G.992.1: Asymmetric digital subscriber line (ADSL) transceivers. (1999). ITU-T Recommendation G.992.1, June.
4. Rigault, C. (2008). Network and telecommunication global service convergence, available at http://www.infres.enst.fr/~rigault/white-paper.pdf in 30/10.
5. Recommendation I.412: ISDN user-network interfaces—Interface structures and access capabilities. (1988). ITU.