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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 ...
The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. . Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is availa
Refdesk - free and family-friendly web site that indexes and reviews quality, credible, and current web-based resources. DeepDyve - big archive of literary and scholarly journal articles; free five-minute full-text previews. Library of free projects - Free project resources (but no software).
PubMed Central is a free digital archive of full articles, accessible to anyone from anywhere via a web browser (with varying provisions for reuse). Conversely, although PubMed is a searchable database of biomedical citations and abstracts, the full-text article resides elsewhere (in print or online, free or behind a subscriber paywall ).
BMJ Open is a peer-reviewed open access medical journal that is dedicated to publishing medical research from all disciplines and therapeutic areas. [1] It is published by BMJ and considers all research study types, from protocols through phase I trials to meta-analyses, including small, specialist studies, and negative studies.
For free user, Google was able to show up to 20% of a copyrighted book via the snippet mode. Google could show ads on these pages and split the ad revenue with authors and publishers. A user could purchase access to a book, treated as an eBook, for a one-time cost. Institutions could acquire full access to all books for a subscription-based fee.
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