PLoS Biology: A Peer-Reviewed Open Access Journal Published by the Public Library of Science

May 16, 2006

Dear Colleague,

I would like to draw your attention to a research paper published online today in PLoS Biology, entitled "Citation Advantage of Open Access Articles" by Gunther Eysenbach (University of Toronto).

The Study

In this study, Eysenbach compared the rate of citations of open access (OA) with non-OA articles from the same journal, PNAS.

Key findings include:

  • OA articles are twice as likely to be cited 4 to 10 months after publication and almost three times as likely between 10 and 16 months.
  • Self-archived articles are cited less often than OA articles from the same journal.

Read the full text of this article—freely available online.

The Editorial

In an accompanying Editorial, PLoS editors discuss the careful evaluation of and decision to publish this paper in the context of our own vested interest in open access publishing.

PLoS Biology

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With best regards,


Hemai Parthasarathy
Managing Editor, PLoS Biology