1. Baeza‐Yates, R. and Ribeiro‐Neto, B. (1999), Modern Information Retrieval, Addison‐Wesley, New York, NY.
2. Borgman, C. (1999), “What are digital libraries? Competing visions”, Information Processing and Management, Vol. 35 No. 3, pp. 227‐43.
3. Brisaboa, N., Duran, M., Penabad, M. and Places, A. (2000), “A collaborative framework for a digital library”, Proceedings of the VI International Workshop on Groupware (CRIWG'2000), Madeira, Portugal, IEEE Computer Society Press, Los Alamitos, CA, pp. 104‐111.
4. Brisaboa, N.R., Paramá, J.R., Penabad, M.R., Places, A.S. and Rodríguez, F.J. (2002), “BVG. La Biblioteca Virtual Gallega”, in Canós, J.H. and García, P. (Eds), Actas de las III Jornadas de Bibliotecas Digitales (JBIDI'2002), El Escorial, Madrid, pp. 163‐72.
5. Dodge, B. (1995), “Some thoughts about WebQuests”, The Distance Educator, Vol. 1 No. 3, pp. 12‐15.