Google Scholar is a search engine which only searches peer-reviewed papers, theses, books, abstracts and other scholarly literature.
Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites. Google Scholar helps you find relevant work across the world of scholarly research.
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Google Scholar Video Tutorial (YouTube)