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This is an author-produced version of a paper published in Library Hi Tech (ISSN 0737-8831). This version has been peer-reviewed, but does not include the final publisher proof corrections, published layout, or pagination. All articles available through Birkbeck ePrints are protected by intellectual property law, including copyright law. Any use made of the contents should comply with the relevant law. Citation for this version: Poll, Roswitha and Payne, Philip (2006). Impact measures for libraries and information services. London: Birkbeck ePrints. Available at