1. Answer Garden: a tool for growing organizational memory;Ackerman,1990
2. Answer Garden 2: merging organizational memory with collaborative help;Ackerman,1996
3. Sharing Expertise: Beyond Knowledge Management;Ackerman,2002
4. Modern Information Retrieval;Baeza-Yates,1999
5. Formal models for expert finding in enterprise corpora;Balog,2006