E-communications household survey and telecom single market survey [documento eletrónico] : roaming results / European Commission
Regulatory analysis of international mobile roaming services [documento eletrónico] / International Telecommunication Union
BEREC report on transparency and comparability of international roaming tariffs [documento eletrónico] / Body of European Regulators for Electronic Communications
Annual report 2013 [documento eletrónico] / Czech Telecommunication Office
Report on the telecommunications market in Poland in 2013 [documento electrónico] / Office of Electronic Communications