Report on the condition of the telecommunications market in Poland in 2009 [documento electrónico] / Office of Electronic Communications
Fixed voice connections and revenue forecast in Portugal to 2015 (databook) [documento electrónico] / Ovum Consulting
Portugal (country regulation overview) [documento electrónico] / Marcela Perez Sirio
Telecoms in 2020 [documento electrónico] : enterprise services / David Molony, Richard Mahony, Pauline Trotter