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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.
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.
An Iranian index of academic journals and access to full text or metadata Free Scientific Information Database: SCIndeks - Serbian Citation Index: Multidisciplinary: 80,000 A bibliographic database, a national citation index, an Open Access full-text journal repository and an electronic publishing platform. Articles from >230 journals. Free
ScienceDirect is a website that provides access to a large bibliographic database of scientific and medical publications of the Dutch publisher Elsevier. It hosts over 18 million pieces of content from more than 4,000 academic journals and 30,000 e-books of this publisher. [ 2][ 3] The access to the full-text requires subscription, while the ...
Open access. Open access ( OA) is a set of principles and a range of practices through which research outputs are distributed online, free of access charges or other barriers. [ 1] With open access strictly defined (according to the 2001 definition), or libre open access, barriers to copying or reuse are also reduced or removed by applying an ...
ASCE Library is an online full-text civil engineering database providing the contents of peer-reviewed journals, proceedings, e-books, and standards published by the American Society of Civil Engineers. The Library offers free access to abstracts of Academic journal articles, proceedings papers, e-books, and standards as well as many e-book ...
SciELO (Scientific Electronic Library Online) is a bibliographic database, digital library, and cooperative electronic publishing model of open access journals.SciELO was created to meet the scientific communication needs of developing countries and provides an efficient way to increase visibility and access to scientific literature. [2]
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 ...