http://www.w3.org/ns/prov#value | - +1 thats excatly what I had in mind :) Additionally it is worth noting that IACR eprint has an info for every paper indicating whether it is unpublished or where it has been published previously (at the moment most of the papers there are extended versions of previously published results, since the paper limits for proceedings are quite low and thus the proceedings versions are typically quite squ
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