1. Augé, M.: Introduction à une anthropologie de la surmodernité, Éditions du Seuil, Paris (1992)
2. Minsky, M.: The society of mind. Simon & Schuster, New York (1986)
3. Web 3D Consortium VRML Specifications,
http://www.web3d.org/x3d/specifications/vrml/
4. VRML 97 External Authoring Interface specification, ISO/IEC 14772-2:2002,
http://www.web3d.org/x3d/specifications/vrml/ISO_IEC_14772-All/index.html
5. Barbieri, T.: Networked Virtual Environments for the Web: The WebTalk-I and WebTalk- II. Architectures. In: Proceedings IEEE for Computer Multimedia & Expo 2000 (ICME), New York, USA, Luglio (2000)