1. | Fixed service using radio-relay systems : recommendations of the CCIR, 1990: (also and resolutions and opinions): volume IX - part 1 / International Telecommunication UnionData Publicação: 1990 Tema: Radiocomunicações | ||
2. | Frequency sharing and coordination between systems in the fixed-satellite service and radio-relay systems : reports of the CCIR, 1990: (also decisions): annex to volumes IV and IX - part 2 / International Telecommunication UnionData Publicação: 1990 Tema: Radiocomunicações | ||
3. | Fixed service using radio-relay systems : reports of the CCIR, 1990: (also decisions): annex to volume IX - part 1 / International Telecommunication UnionData Publicação: 1990 Tema: Radiocomunicações | ||
4. | XVIIth Plenary Assembly, Dusseldorf : recommendations of the CCIR: / International Telecommunication UnionData Publicação: 1990 Tema: Radiocomunicações |