Fixed service using radio-relay systems : reports of the CCIR, 1990: (also decisions): annex to volume IX - part 1 / International Telecommunication Union
Propagation in non-ionized media : reports of the CCIR, 1990: (also decisions): annex to volume V / International Telecommunication Union
Standard frequencies and time signals : reports of the CCIR, 1990: (also decisions): annex to volume VII / International Telecommunication Union
Television and sound transmission (CMTT) : reports of the CCIR, 1990: (also decisions): annex to volume XII / International Telecommunication Union