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
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