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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.
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.
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 ...
As of the same date, 24.6 million of PubMed's records are listed with their abstracts, and 26.8 million records have links to full-text versions (of which 10.9 million articles are available, full-text for free). [8] Over the last 10 years (ending 31 December 2019), an average of nearly one million new records were added each year.
CiteScore ( CS) of an academic journal is a measure reflecting the yearly average number of citations to recent articles published in that journal. It is produced by Elsevier, based on the citations recorded in the Scopus database. Absolute rankings and percentile ranks are also reported for each journal in a given subject area.
For most articles on the website, abstracts are freely available; access to the full text of the article (in PDF, and also HTML for newer publications) often requires a subscription or pay-per-view purchase. [36] In 2019, Elsevier published 49,000 free open access articles and 370 full open access journals.
The "share" is lower than the count because for each article it is based on the number of nationals who have contributed, divided by the total number of contributors. In many cases the "share" will be much lower than the "count" because the "count" includes articles published by institutions which may have only a very few members of the ...
Full-text search. In text retrieval, full-text search refers to techniques for searching a single computer -stored document or a collection in a full-text database. Full-text search is distinguished from searches based on metadata or on parts of the original texts represented in databases (such as titles, abstracts, selected sections, or ...