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dc.contributor.authorMartín Martín, Alberto 
dc.contributor.authorCostas, Rodrigo
dc.contributor.authorvan Leeuwen, Thed
dc.contributor.authorDelgado López-Cózar, Emilio
dc.description.abstractThis article uses Google Scholar (GS) as a source of data to analyse Open Access (OA) levels across all countries and fields of research. All articles and reviews with a DOI and published in 2009 or 2014 and covered by the three main citation indexes in the Web of Science (2,269,022 documents) were selected for study. The links to freely available versions of these documents displayed in GS were collected. To differentiate between more reliable (sustainable and legal) forms of access and less reliable ones, the data extracted from GS was combined with information available in DOAJ, CrossRef, OpenDOAR, and ROAR. This allowed us to distinguish the percentage of documents in our sample that are made OA by the publisher (23.1%, including Gold, Hybrid, Delayed, and Bronze OA) from those available as Green OA (17.6%), and those available from other sources (40.6%, mainly due to ResearchGate). The data shows an overall free availability of 54.6%, with important differences at the country and subject category levels. The data extracted from GS yielded very similar results to those found by other studies that analysed similar samples of documents, but employed different methods to find evidence of OA, thus suggesting a relative consistency among methods.es_ES
dc.description.sponsorshipAlberto Martín-Martín enjoys a four-year doctoral fellowship (FPU2013/05863) granted by the Ministerio de Educación, Cultura, y Deportes (Spain). Funding from the South African DST-NRF Centre of Excellence in Scientometrics and Science, Technology and Innovation Policy (SciSTIP) is also acknowledged.es_ES
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs 3.0 Licensees
dc.subjectacademic publisherses_ES
dc.subjectacademic search engineses_ES
dc.subjectacademic social networkses_ES
dc.subjectcreative commonses_ES
dc.subjectgoogle scholares_ES
dc.subjectinstitutional repositorieses_ES
dc.subjectopen accesses_ES
dc.subjectopen research metadataes_ES
dc.titleEvidence of Open Access of scientific publications in Google Scholar: a large-scale analysises_ES

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Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License