Internet traffic prioritisation [documento electrónico] : an overview / Organisation for Economic co-Operation and Development
VoIP quality of service regulation [documento electrónico] : encouragement or enforcement? / Dianne Northfield
Estudo europeu sobre a satisfação com os serviços de telecomunicações 2007 (telefone fixo, telemóvel, Internet, e TV por subscrição) [documento electrónico] / João Bento, Tereza Garrana, Paulo Paula
Índice nacional de satisfação do cliente : resultados dos sectores: banca: combustíveis: comunicações: seguros: transportes de passageiros: 2006 / Manuel José Vilares e Pedro Simões Coelho e Susana Esteves
Pan european customer satisfaction 2006 / EPSI Rating
EN 14508 [documento electrónico] : 2003+A1: postal services: quality of service: measurement of the transit time of end-to-end services for single piece non-priority mail and second class mail / European Committee for Standardization
EN 14534 [documento electrónico] : 2003+A1: postal services: quality of service: measurement of the transit time of end-to-end services for bulk mail / European Committee for Standardization