Legalidade e administração pública : o sentido da vinculação administrativa à juridicidade / Paulo Otero
CRAF handbook for frequency management / ed. Titus Spoelstra
Progress toward liberalization of the postal and delivery sector / ed. by Michael A. Crew and Paul K. Kleindorfer
Telecommunication laws in Europe : law and regulation of electronic communications in Europe / ed. by Joachim Scherer