scholar.google.com
Google search engine for scholarly articles, books, citations, patents, and academic profiles.
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pubmed.ncbi.nlm.nih.gov
PubMed is a biomedical literature search service that hosts more than 40 million citations from MEDLINE, life science journals, and online books. Some citations include links to full-text content from PubMed Central and publisher websites. The service provides tools such as advanced search, clinical queries, and a single citation matcher to help users locate relevant research.