Google Scholar - Google Scholar is a freely accessible web search engine that indexes the full text of scholarly...
Web of Knowledge - Thomson Reuters Web of KnowledgeSM is a research platform that gives you access to objective...
Scopus - Scopus is a bibliographic database containing abstracts and citations for academic journal articles.
SemanticScholar - An academic search engine that utilizes artificial intelligence methods to provide highly relevant results and novel tools to filter them with ease.
Biohunter - Biohunter is a one-stop portal for literature search, batch-download PDFs and reference manager
PubMed.gov - PubMed comprises more than 29 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.