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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 ...
Paperity - multidisciplinary aggregator of Open Access journals and papers; provides free full text, advanced search and permanent URLs for all articles ipl2 [2] - merger of the collections of resources from the Internet Public Library (IPL) and the Librarians' Internet Index (LII) websites, hosted by Drexel University College of Information ...
Databases and search engines differ substantially in terms of coverage and retrieval qualities. [1] Users need to account for qualities and limitations of databases and search engines, especially those searching systematically for records such as in systematic reviews or meta-analyses. [ 2 ]
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