Study on assessing the efficiency of radio spectrum award processes in the Member States, including the effects of applying the European electronic communications code [documento eletrónico] / European Commission
100 years of the International Union of Radio Science [documento eletrónico] / ed. Philip Wilkinson, Paul S. Cannon, W. Ross Stone
URSI portuguese member committee [documento eletrónico] : contributions for the 100 years of URSI / José Pedro Borrego...[et al.]