Comunicações técnicas : seminário Marconi sobre serviços de telecomunicacões de valor acrescentado; / [ed.lit.] Marconi
International strategic leadership conference 1998 [Briefings] / org. by the The Strategic Leadership Forum
Perspectives des communications 1993 / Organisation de Coopération et de Développement Économiques
Perspectives des communications 1997 [texto policopiado] / Organisation for Economic co-Operation and Development