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The terms "free", "subscription", and "free & subscription" will refer to the availability of the website as well as the journal articles used. Furthermore, some programs are only partly free (for example, accessing abstracts or a small number of items), whereas complete access is prohibited (login or institutional subscription required).
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 ...
JSTOR (/ ˈ dʒ eɪ s t ɔːr / JAY-stor; short for Journal Storage) [2] is a digital library of academic journals, books, and primary sources founded in 1994. Originally containing digitized back issues of academic journals, it now encompasses books and other primary sources as well as current issues of journals in the humanities and social sciences. [3]
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.
Open access. Open access logo, originally designed by Public Library of Science. A PhD Comics introduction to open access. Open access (OA) is a set of principles and a range of practices through which nominally copyrightable publications are delivered to readers free of access charges or other barriers. [1]
doaj.org. Commercial. No. Launched. 2003. Current status. Online. The Directory of Open Access Journals (DOAJ) is a website that hosts a community-curated list of open access journals, maintained by Infrastructure Services for Open Access (IS4OA). [1] It was launched in 2003 with 300 open access journals.
ScienceDirect is a searcheable web-based bibliographic database, which provides access to full texts of scientific and medical publications of the Dutch publisher Elsevier as well of several small academic publishers. It hosts over 18 million publons from more than 4,000 academic journals and 30,000 e-books. [2][3] The access to the full-text ...
Academia.edu is a commercial platform for sharing academic research that is uploaded and distributed by researchers from around the world. All academic articles are free to read by visitors, however uploading and downloading articles is restricted to registered users, with additional features accessible only as a paid subscription. [3][4]