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. 2014 Aug 28;9(8):e104798. doi: 10.1371/journal.pone.0104798

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© 2014 Pepe et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Percentages of broken external links in all articles published between 1997 and 2008 in the four main astronomy journals. Black circles represent links to personal websites (link values contain the tilde symbol, ^∼), while red crosses represent links to curated archives such as governmental and institutional repositories.