Evidence of Open Access of scientific publications in Google Scholar: a large-scale analysis

Working Paper by Alberto Martín-Martín et al.: https://arxiv.org/abs/1803.06161 "This 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 dif..