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Google Scholar - Google Scholar is a freely accessible web search engine that indexes the full text of scholarly...
SemanticScholar - An academic search engine that utilizes artificial intelligence methods to provide highly relevant results and novel tools to filter them with ease.
Scinapse - Scinapse is a free, nonprofit, Academic search engine for papers, serviced by Pluto Network.
Scopus - Scopus is a bibliographic database containing abstracts and citations for academic journal articles.
Biohunter - Biohunter is a one-stop portal for literature search, batch-download PDFs and reference manager
Science.gov - Science.