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1. www.ncbi.nlm.nih.gov › pmcHome - PMC - NCBI - National Center for Biotechnology Information

   www.ncbi.nlm.nih.gov › pmc

   PubMed Central ® (PMC) is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM) About PMC. Discover a digital archive of scholarly articles, spanning centuries of scientific research. User Guide.

   • User Guide

     User Guide - Home - PMC - NCBI - National Center for...

   • About PMC

     About PMC. PubMed Central ® (PMC) is a free full-text...

   • Collections

     PMC Collections. PubMed Central ® (PMC) archives millions of...

   • For Publishers

     For Publishers - Home - PMC - NCBI - National Center for...

   • For Developers

     Not all articles in PMC are available for text mining and...

   • Clipboard

     The .gov means it's official. Federal government websites...

   • Public Access

     PubMed Central (PMC) was established in 2000 as the National...

   • New Isatin–Indole Conjugates

     Indole (1H-benzo[b]pyrrole, II, Figure 1) has a bicyclic...

   • Upsides

     DOI: 10.1192/S2056474000000064 [PMC free article] [Google...

   • PMC

     PMC - Home - PMC - NCBI - National Center for Biotechnology...

2. scholar.google.comGoogle Scholar

   scholar.google.com

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   Google Scholar provides a simple way to broadly search for scholarly literature. Search across a wide variety of disciplines and sources: articles, theses, books, abstracts and court opinions.

3. People also ask

   Where can I find open access journals & articles?

   • Find open access journals & articles. DOAJ is a unique and extensive index of diverse open access journals from around the world, driven by a growing community, and is committed to ensuring quality content is freely available online for everyone.

   Directory of Open Access Journals – DOAJ

   doaj.org/

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   How many free scholarly articles are there?

   • An open database of 50,085,221 free scholarly articles. We harvest Open Access content from over 50,000 publishers and repositories, and make it easy to find, track, and use. —Nature feature article, August 2018 We're integrated into thousands of library systems, search platforms, and other information products worldwide.

   Unpaywall

   unpaywall.org/

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   What is early journal content?

   • Early Journal Content, articles published prior to the last 95 years in the United States, or prior to the last 143 years if initially published internationally, are freely available to all Even more content is available when you register to read – millions of articles from nearly 2,000 journals

   Open and free content on JSTOR and Artstor - About JSTOR

   about.jstor.org/oa-and-free/

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4. doaj.orgDirectory of Open Access Journals – DOAJ

   doaj.org

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   DOAJ is a unique and extensive index of diverse open access journals from around the world, driven by a growing community, and is committed to ensuring quality content is freely available online for everyone. DOAJ is committed to keeping its services free of charge, including being indexed, and its data freely available. → About DOAJ.

5. unpaywall.orgUnpaywall

   unpaywall.org

   An open database of 50,227,918 free scholarly articles. We harvest Open Access content from over 50,000 publishers and repositories, and make it easy to find, track, and use. Get the extension. "Unpaywall is transforming Open Science" —Nature feature article, August 2018. Used and trusted by top organizations.

6. pubmed.ncbi.nlm.nih.govPubMed

   pubmed.ncbi.nlm.nih.gov

   Follow NCBI. PubMed® comprises more than 37 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.

7. about.jstor.org › oa-and-freeOpen and free content on JSTOR and Artstor - About JSTOR

   about.jstor.org › oa-and-free

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   Search open content on JSTOR. Journals. Explore our growing collection of Open Access journals. Early Journal Content, articles published prior to the last 95 years in the United States, or prior to the last 143 years if initially published internationally, are freely available to all.