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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 available.
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 ...
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.
In a 2015 comparison with MEDLINE, PubMed Central, EMBASE and SCOPUS, DOAJ resulted to have the highest number of open access journals listed, but less than a half of them had actively published contents on DOAJ. [13] There is a partnership DOAJ and OpenAIRE since October 2022. [14] [15]
In addition, CiteSeer and Google Scholar are freely available online. Several open-access, subject-specific citation indexing services also exist, such as: INSPIRE-HEP which covers high energy physics, PubMed, which covers life sciences and biomedical topics, and; Astrophysics Data System which covers astronomy and physics.
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.
The Science Citation Index Expanded (previously titled Science Citation Index) is a citation index originally produced by the Institute for Scientific Information (ISI) and created by Eugene Garfield. The Science Citation Index (SCI) was officially launched in 1964, [ 1] and later was distributed via CD / DVD. [ 2]
Academic Search Complete. Academic Search is a monthly indexing service. It was first published in 1997 by EBSCO Publishing in Ipswich, Massachusetts. Its academic focus is international universities, covering social science, education, psychology, and other subjects. Publishing formats covered are academic journals, magazines, newspapers, and ...