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Academic search engines have become the number one resource used to find research papers and other scientific resources. While classic academic databases like Web of Science and Scopus are locked behind a paid wall, Google Scholar and others can be accessed for free.
List of the Most Popular and Best Journals or Scientific Article Search Engines for Free
To help you complete your research quickly, we have compiled a list of the top academic search engines as follows:
1. Google Scholar
Google Scholar is definitely number one when it comes to academic search engines. This is the power of Google search applied to patented research papers. On Google Scholar you can find research papers for all disciplines for free, but also often provide links to full-text PDF files. How to Index Journal Articles Into Google Scholar Easily.
- Coverage: approx. 200 million articles Abstract: only available abstract snippets
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2. Microsoft Academic
With advances in science and technology occurring at an astonishing speed, the formal recognition and classification of new concepts and fields of study is an ongoing struggle. Over the past year, the Microsoft Academic Graph (MAG) team has been trying to tackle this issue head-on with changes to the way we discover and the way we categorize new fields of study.
These efforts have resulted in the MAG now understanding more than 700 thousand subject areas, with almost 75% included in the field of study hierarchy. This marks a 3x increase over the most recent disclosures you can see in the 2018 ACL demo paper.
Also Read: List of International Reputable Journal Index (World)
Microsoft Academic takes a different approach and generates for each indexed paper an overview page that allows for easy browsing of articles and article references.
- Coverage: approx. 210 million articles
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3. BASE
BASE is one of the most productive search engines in the world, especially for academic web resources. BASE provides more than 240 million documents from more than 8,000 content providers. You can access the full text of about 60% of the indexed documents for free (Open Access). BASE is operated by the Bielefeld University Library. BASE is hosted at Bielefeld University in Germany and that is where the name comes from (Bielefeld Academic Search Engine).
BASE can index metadata of all kinds of academically relevant resources - journals, institutional repositories, digital collections, etc. - which provides an OAI interface and uses OAI-PMH to provide content.
Also Read: How to Submit Articles in Scopus Indexed International Journals
- Coverage: approx. 240 million articles (contains duplicates)
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4. CORE
CORE is an academic search engine dedicated to open access research papers. For each search result, a link to a full-text PDF or full-text webpage is provided. CORE's role in providing a unified search of repository content is that it is a great search engine for researchers and expands the reach of locally owned content in the institutional repository, Open Research Online.
- Coverage: approx. 136 million articles
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- Link to full text: (all articles on INTI are open access)
- Export format: BibTeX
5. Science.gov
Science.gov is a great resource because it combines and offers free access to search results from more than 15 US federal agencies. No more querying all those resources separately!
- Coverage: approx. 200 million articles and reports
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- Link to full text: (available for some databases)
- Export formats: APA, MLA, RIS, BibTeX (available for some databases)
6. Semantic Scholar
Unlike Google Scholar, Semantic Scholar uses AI to extract meaning from research literature. It helps researchers to explore the literature in new ways. Each database has its own scope and search algorithm. When you want to search for more papers on a particular topic, you should try several databases.
Also Read: Tricks and Trips for Writing High-Quality Articles or Journals
As expected, Semantic Scholar found different results than Google Scholar. Suppose you do a search with the term “social inequality in public health” in the two, between the results of the first screen, there is no similarity. On Google Scholar, the most cited papers stand out more at the top of the list in Semantic Scholar calculating relevance in a different way.
- Coverage: approx. 40 million articles
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7. Baidu Scholar
Although Baidu Scholar's interface is in Chinese, its index contains research papers in English as well as Chinese.
- Coverage: detailed statistics not available, approx. 100 million articles
- Abstract: only abstract snippet available
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