III Fórum telecom & media : 22 de Setembro de 2004, Lisboa / org. Diàrio Económico
The 2012 super frequency list : broadcast and utility / ed. Klingenfuss Publications
The 2015 super frequency list : broadcast and utility / ed. Klingenfuss Publications
European postal services : 7th annual conference: 8th,9th & 10th March 2004, Hotel Okura, Amsterdam / org. The Institute of Economic Affairs