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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. . 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 ...
Spain stated, "There was a glaring gap between free search like Google and high-end offerings like LexisNexis and Factiva." [4] Later in 2002, it bought Researchville.com. By 2003, it had increased its archive base to articles from 2,600 publishers. In 2004, it was renamed HighBeam Research. In 2005, it increased its publisher base to 3,500 ...