Time signals and frequency standards emissions : supplement 1 to volume 1997 TF series / ITU-R
Time signals and frequency standards emissions : supplement 1 to volume 2000 TF series / International Telecommunication Union
1994 V series : vocabulary and related subjects: ITU-R recommendations / ITU-R
Règlement des radiocommunications / Secrétariat général [de] l'Union Internationale des Télécommunications