Google Scholar
Free search across scholarly articles, theses, books and court opinions, with "cited by" counts and links to full text where available.
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- Shows sources for its answers
Bielefeld Academic Search Engine: a free search across records harvested from thousands of academic repositories.
Not enough info yet on open source, works in Word or Google Docs, developer API, shows sources for its answers, mobile app. Check the tool's own site.
Listing written by ResearchBest, checked 2026-11-03. Report a correction or request removal. Back to paper search and indexes.