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Focus on fulltext search of open access journals and conference proceedings Free Yes Internet Archive: CORE [3] Multidisciplinary: 9,800,000 [4] (207,000,000 metadata [5]) A full text aggregator of all open access papers from repositories (institutional, subject, preprints, etc.) and journals. Around 20 million monthly active users. Free
PubMed Central is a free digital archive of full articles, accessible to anyone from anywhere via a web browser (with varying provisions for reuse). Conversely, although PubMed is a searchable database of biomedical citations and abstracts, the full-text article resides elsewhere (in print or online, free or behind a subscriber paywall).
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 ...
The full text of all the documents submitted to Shodhganga are available to read and to download in open access to the academic community worldwide. The repository has a collection of over 500,000 theses and 13000 synopses.
Full-text documents of scientific and technical information dating primarily from 1991 to the present day are available for download. Legacy documents are added as they become available in electronic format. Most DOE technical reports from the 1940s to 1991 are still only available in hard copy.
CORE (Connecting Repositories) is a service provided by the Knowledge Media Institute [Wikidata] based at The Open University, United Kingdom.The goal of the project is to aggregate all open access content distributed across different systems, such as repositories and open access journals, enrich this content using text mining and data mining, and provide free access to it through a set of ...
Access to the full-text pdfs of non-open access publications require either a subscription (to the specific journal rather than to the whole database) or per-article/book payment. Subscriptions to the overall content hosted on ScienceDirect, rather than to specific titles, are usually acquired through what is called a big deal .
As of 2019, download by users is generally subject to registration and/or completion of a ReCAPTCHA challenge and therefore SSRN is not considered by some to be a suitable open access location, [13] unlike open archives like most institutional repositories. Publishers and institutions can upload papers and charge a fee for readers to download ...