Broadcasting service (sound) : recommendations of the CCIR, 1990: (also and resolutions and opinions): volume X - part 1 / International Telecommunication Union
UIT-R recommendations [CD-ROM] / International Telecommunication Union; Radiocommunication Bureau
Space research and radioastronomy services : reports of the CCIR, 1990: (also opinions): annex to volume II / International Telecommunication Union
Fixed service at frequences below about 30 Mhz : reports of the CCIR, 1990: (also decisions): annex to volume III / International Telecommunication Union