E-communications and telecom single market household survey [documento eletrónico] : report / European Commission
Portugal [documento eletrónico] : country regulation overview / Inderpreet Kaur
The development of fixed broadband networks [documento eletrónico] / Organisation for Economic co-Operation and Development
Global fixed voice and broadband outlook [documento eletrónico] : 2014-2019 / Kamalini Ganguly