Spectrum utilization and monitoring : reports of the CCIR, 1990: (also decisions): annex to volume I / International Telecommunication Union
Space research and radioastronomy services : reports of the CCIR, 1990: (also opinions): annex to volume II / International Telecommunication Union
Fixed-satellite service : reports of the CCIR, 1990: (also decisions): annex to volume IV - part 1 / International Telecommunication Union
Fixed service using radio-relay systems : reports of the CCIR, 1990: (also decisions): annex to volume IX - part 1 / International Telecommunication Union