Google Scholar is an online, freely accessible search engine that lets users look for both physical and digital copies of articles. It searches a wide variety of sources, including academic publishers, universities, and preprint depositories looking for: Peer-reviewed articles.
Theses 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.