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Levene, Mark and Borges, J. and Loizou, George (2001) Zipf's Law for web surfers. Knowledge and Information Systems 3 (1), pp. 120-129. ISSN 0219-1377.

Levene, Mark and Loizou, George (2001) Guaranteeing no interaction between functional dependencies and tree-like inclusion dependencies. Theoretical Computer Science 254 (1-2), pp. 683-690. ISSN 0304-3975.

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Mat-Hassan, Mazlita and Levene, Mark (2001) Can navigational assistance improve search experience? A user study. First Monday 6 (9), ISSN 1396-0466.