Public service obligations and competition [documento eletrónico] / Michael Harker, Antje Kreutzmann, Catherine Waddams
Public service obligations and competition [documento eletrónico] : final report / Michael Harker, Antje Kreutzmann, Catherine Waddams
Universal Service [texto policopiado] : does competition help or hurt? / Pedro P. Barros, M. Carmo Seabra