Spectrum management : supplement 1 to volume 1997 SM Series / ITU-R
Spectrum management : supplement 2 to volume 1997 SM Series / ITU-R
Satellite news gathering : supplement 1 to volume 1997 SNG Series / International Telecommunication Union
ITU-R SNG series : satellite news gathering: ITU-R recommendations (new and revised as of 9 September 1993) / ITU-R