Space research and radioastronomy services : recommendations of the CCIR, 1990: (also and resolutions and opinions): volume II / International Telecommunication Union
Services de recherche spatiale et de radioastronomie : recommandations du CCIR, 1990: (ainsi que résolutions et voeux): volume II / Union Internationale des Télécommunications
Fixed service at frequences below about 30 Mhz : recommendations of the CCIR, 1990: (also and resolutions and opinions): volume III / International Telecommunication Union
Fixed-satellite service : recommendations of the CCIR, 1990: (also and resolutions and opinions): volume IV - part 1 / International Telecommunication Union