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    The work discussed here has received financial support by the Joint Information Systems committee of the UK Higher Education Funding Councils through its Electronic Library Programme. A version of this paper was presented at the PEAK conference at the University of Michigan on 2000 03 24. I am grateful to Ivan V. Kurmanov for comments on that version. In March 2001, I revised and updated the paper following suggestions by Jeffrey K. MacKie-Mason and Emily Walshe. Neither of them bear responsibility for any remaining errors. This paper is available online at http://openlib.org/home/krichel/salibury.html.

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