OECD mobile voice price benchmarking [recurso eletrónico] / ed. Teligen - Strategy Analytics
OECD PSTN voice & leased line price benchmarking [recurso eletrónico] / ed. Teligen - Strategy Analytics
Regulating broadband prices [documento eletrónico] / International Telecommunication Union
Report on the telecommunications market in Poland in 2011 [documento electrónico] / Office of Electronic Communications
Market review 2011 [documento eletrónico] / Hellenic Telecommunications and Post Commission