Herbert Van de Sompel, Martin Klein, and Shawn M. Jones have self-archived "Persistent URIs Must Be Used to Be Persistent."
Here's an excerpt:
We quantify the extent to which references to papers in scholarly literature use persistent HTTP URIs that leverage the Digital Object Identifier infrastructure. We find a significant number of references that do not, speculate why authors would use brittle URIs when persistent ones are available, and propose an approach to alleviate the problem.
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