1. A user centered interface for information exploration in a heterogeneous digital library;Baldonado;Journal of the American Society for Information Science,2000
2. Cognitive approach for building user model in an information retrieval context;Belhassen,2000
3. Anomalous states of knowledge as the basis for information retrieval;Belkin;Canadian Journal of Information Science,1980
4. Intelligent information retrieval: whose intelligence?;Belkin,1996
5. What are digital libraries? Competing visions;Borgman;Information Processing and Management,1999