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Archambault, E. et al. Proportion of Open Access Peer-Reviewed Papers at the European and World Levels — 2004–2011 (Science-Metrix, 2013).
Laakso, M. & Björk, B.-C. BMC Med. 10, 124 (2012).
Björk, B.-C., Laakso, M., Welling, P. & Paetau, P. J. Am. Soc. Inf. Sci. Technol. (in the press).
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Van Noorden, R. Half of 2011 papers now free to read. Nature 500, 386–387 (2013). https://doi.org/10.1038/500386a
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DOI: https://doi.org/10.1038/500386a