1. Challiol, C., Rossi, G., Gordillo, S., De Cristófolo, V.: Designing and Implementing Physical Hypermedia Applications. In: Proceedings of the 2006 Workshop on Ubiquitous Web and System Intelligence (UWSI 2006). LNCS. Springer, Heidelberg (forthcoming, 2006)
2. Cheverst, K., Davies, N., Mitchell, K., Friday, A., Efstratiou, C.: Developing a Context-Aware Electronic Tourist Guide: Some Issues and Experiences. In: Proc. of CHI 2000 (2000)
3. Lecture Notes in Computer Science;F. Espinoza,2001
4. Gamma, E., Helm, R., Johnson, J., Vlissides, J.: Design Patterns. Elements of reusable object-oriented software. Addison Wesley, Reading (1995)
5. Goble, C.A., Harper, S., Stevens, R.: The travails of visually impaired web travellers. In: UK Conference on Hypertext, pp. 1–10 (2000)