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 Union
Propagation in ionized media : reports of the CCIR, 1990: (also decisions): annex to volume VI / International Telecommunication Union
Standard frequencies and time signals : reports of the CCIR, 1990: (also decisions): annex to volume VII / International Telecommunication Union
Broadcasting service (sound) : reports of the CCIR, 1990: (also decisions): annex volume X - part 1 / International Telecommunication Union
Fixed service at frequences below about 30 Mhz : recommendations of the CCIR, 1990: (also and resolutions and opinions): volume III / International Telecommunication Union
XVIIth Plenary Assembly, Dusseldorf : recommendations of the CCIR: / International Telecommunication Union
Propagation in ionized media : recommendations of the CCIR, 1990: (also and resolutions and opinions): volume VI / International Telecommunication Union
Standard frequencies and time signals : recommendations of the CCIR, 1990: (also and resolutions and opinions): volume VII / International Telecommunication Union