1. Information tasks;Allen,1996
2. The identification of user relevance criteria and document characteristics: Beyond the topical approach to information retrieval;Barry,1993
3. User-defined relevance criteria: an exploratory study;Barry;Journal of the American Society for Information Science,1994
4. The problem of ‘matching’ in information retrieval;Belkin,1980
5. ASK for information retrieval;Belkin;Journal of Documentation,1982