Half of All Papers Now Free in Some Form, Study Claims. Kaiser, J. 341(6148):830.
Half of All Papers Now Free in Some Form, Study Claims [link]Paper  doi  abstract   bibtex   
In 2011, for the first time, 50\,% of recent scientific papers became freely available though some kind of "open-access" journal or website, a new study commissioned by the European Union concludes. That could mark a tipping point in scientific publishing, and a major landmark for advocates of open access. But some observers are skeptical of the study's methods and results.
@article{kaiserHalfAllPapers2013,
  title = {Half of All Papers Now Free in Some Form, Study Claims},
  author = {Kaiser, Jocelyn},
  date = {2013-08},
  journaltitle = {Science},
  volume = {341},
  pages = {830},
  issn = {1095-9203},
  doi = {10.1126/science.341.6148.830},
  url = {https://doi.org/10.1126/science.341.6148.830},
  abstract = {In 2011, for the first time, 50\,\% of recent scientific papers became freely available though some kind of "open-access" journal or website, a new study commissioned by the European Union concludes. That could mark a tipping point in scientific publishing, and a major landmark for advocates of open access. But some observers are skeptical of the study's methods and results.},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-12594178,free-scientific-knowledge,gold-open-access,green-open-access,open-access,open-science,scientific-knowledge-sharing},
  number = {6148}
}
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