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Remarkable Growth of Open Access in the Biomedical Field: Analysis of PubMed Articles from 2006 to 2010

Figure 2

Transitionin OA provision methods.*

* Because multiple OA sources for each article were counted, the percentages for each year add up to more than 100%.

Figure 2

doi: https://doi.org/10.1371/journal.pone.0060925.g002