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: A Chrome extension that finds the DOI of a paper on your current page and automatically searches for it across various open-access repositories like ArXiV and the Internet Archive .

: A highly popular site that provides access to over 64.5 million academic papers by bypassing publisher paywalls through educational institution proxies. Download Zh092022 pdf

: Many researchers upload their full-text papers here; you can often download them directly or request the full text from the authors. Helpful Browser Extensions & Tools : A Chrome extension that finds the DOI

: Similar to Unpaywall, it helps users find legal, free versions of research articles that are behind paywalls. Specialized Academic Search Engines Helpful Browser Extensions & Tools : Similar to

: These platforms collectively offer over 10 million books and 85 million articles.

For discovering these papers, the following search engines are highly effective: Google Scholar Semantic Scholar CORE Baidu Scholar The best academic search engines [Update 2025] - Paperpile