Sergio has been invited to speak at the "Les rencontres de la Ville" seminar in Paris, organized by the Secrétariat Général du Comité Interministériel des Villes  on September 29th 2011 (download the Programme). His lecture, entitled "Comment penser la place des services dans le fonctionnement de l’espace urbain?" has been recorded in video and is available here: LINK TO VIDEO along with those by Jean-Francois Revah and Charles Rojzman. Sergio's talk is in Italian, translated in French.