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References
- ↑ Goodman, James (2003). Mobile telephones and social capital in Poland. A case study with Vodafone Group. Final Report, April 2003. Final version of the case study "Mobile telephones and social capital in Poland" - part of the Deliverable 12 (D12) of the project DEESD - Digital Europe: e-business and sustainable development. (p. 25) (retrieved 20 October 2008)
- 1 2 Kelly, Tim (2005). Redrawing the Jipp Curve for Africa. Retraçons la courbe de Jipp pour l'Afrique. The Acacia Atlas Archived 2011-06-09 at the Wayback Machine (retrieved 20 October 2008)
- ↑ Jipp, A. (1963). Wealth of nations and telephone density. Telecommunications Journal, July 1963, pp. 199-201.
- ↑ Kenny, Charles (2005). Reforming the posts: Abandoning the monopoly-supported postal universal service obligation in developing countries. AEI-Brookings Joint Center for Regulatory Studies. Related Publication 05-17. (p. 1) (retrieved 16 August 2007)
