Handbook guide to the use of ITU-T publications produced by study group 5 aimed at achieving electromagnetic compatibility and safety / ITU
Study of management information systems for telecommunications authorities and appropriate application of the information technology / International Telecommunication Union
Opinions and resolutions recommendations on the organization and working procedures of CCITT (series A) / International Telecommunication Union
Terms and definitions abbreviations and acronyms : recommendations on means of expression (series B): general telecommunications statistics (series C) / International Telecommunication Union