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2. List of academic databases and search engines - Wikipedia

   en.wikipedia.org/wiki/List_of_academic_databases...

   Database of articles in the Japanese language from 3600 journals Free & Subscription National Institute of Informatics: CNKI: Multidisciplinary: 160,000,000 A Chinese bibliographic database Free & Subscription CNKI: CORE [3] Multidisciplinary: 207,000,000 [5] Around 20 million monthly active users. Free Open University: Crossref [33 ...

3. PubMed Central - Wikipedia

   en.wikipedia.org/wiki/PubMed_Central

   PubMed Central (PMC) is a free digital repository that archives open access full-text scholarly articles that have been published in biomedical and life sciences journals. As one of the major research databases developed by the National Center for Biotechnology Information (NCBI), PubMed Central is more than a document repository.

4. Google Scholar - Wikipedia

   en.wikipedia.org/wiki/Google_Scholar

   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 ...

5. PubMed - Wikipedia

   en.wikipedia.org/wiki/PubMed

   PubMed is a free database including primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval.

6. List of open-access journals - Wikipedia

   en.wikipedia.org/wiki/List_of_open-access_journals

   This is a list of open-access journals by field. The list contains notable journals which have a policy of full open access. It does not include delayed open access journals, hybrid open access journals, or related collections or indexing services. True open-access journals can be split into two categories:

7. Wikipedia:List of free online resources - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:List_of_free...

   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 ...