CISPR 13 [documento eletrónico] : sound and television broadcast receivers and associated equipment; : radio disturbance characteristics; : limits and methods of measurement / International Electrotechnical Commission
Anuário da comunicação 2013-2014 [documento eletrónico] / Gustavo Cardoso...[et al.]
Annual report and accounts 2014-2015 [documento eletrónico] / Office of Communications