| Google Scholar |
CORE |
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| Google Scholar is a popular starting point for finding scholarly literature across many disciplines and sources, including theses, books, abstracts and articles |
Mission is to aggregate all open access research outputs from repositories and journals worldwide and make them available to the public. In this way CORE facilitates free unrestricted access to research for all |
| ScienceResearch.com |
BASE |
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| Provides a single point of access to more than 400 high-quality, publicly searchable science and technology collections |
BASE is one of the world's most voluminous search engine, specially for academic web resources. BASE provides more than 150 million documents from more than 7,000 sources |
| Semantic Scholar |
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| Semantic Scholar is as a search engine mainly for the fields of computer science, geoscience, and neuroscience |
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