![]() ![]() Google Scholar has been criticized for not vetting journals and for including predatory journals in its index. ![]() This estimate also determined how many documents were freely available on the internet. An earlier statistical estimate published in PLOS One using a mark and recapture method estimated approximately 79–90% coverage of all articles published in English with an estimate of 100 million. For content to be indexed in Google Scholar, it must meet certain specified criteria. Google Scholar uses a web crawler, or web robot, to identify files for inclusion in the search results. Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other scholarly literature, including court opinions and patents. ![]() Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. ![]()
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