Actes finals de la conférence de plénipotentiaires additionnelle / org. Union Internationale des Télécommunications
Relatório : workshop sobre ONP para sistemas de terminais de satélites: Bruxelas, 16/02/93 / Instituto das Comunicações de Portugal
Laboratory activities [1992] / PTT Research
Final acts of the additional plenipotentiary conference : (Geneva 1992 / International Telecommunication Union