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Hajjem C, Harnad S & Gingras Y (2005) Ten-Year Cross-Disciplinary Comparison of the Growth of Open Access and How it Increases Research Citation Impact. IEEE Data Engineering Bulletin, 28(4), December 2005.http://eprints.ecs.soton.ac.uk/11688/.

Metcalfe TS (2005) The Rise and Citation Impact of astro-ph in Major Journals. Bulletin of the American Astronomical Society 37(2). http://arxiv.org/abs/astro-ph/0503519.

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