International mobile roaming services [documento eletrónico] : facilitating competition and protection users / International Telecommunication Union
Strategies for the deloyment of NGN in broadband environment [documento eletrónico] : regulatory and economic aspect / International Telecommunication Union
Taxing telecommunication / ICT services [documento eletrónico] : an overview / International Telecommunication Union
Universal service fund and digital inclusion for all [documento eletrónico] : report / International Telecommunication Union