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mdpi is a publisher of peer-reviewed, open access journals since its establishment in 1996.

semantic scholar uses groundbreaking ai and engineering to understand the semantics of scientific literature to help scholars discover relevant research.

sci-hub website. get free access to academic journals. download research papers for free from sciencedirect, ieee, wiley, springer, nature and others

science/aaas peer-reviewed journals deliver impactful research, daily news, expert commentary, and career resources.

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sci-hub website. get free access to academic journals. download research papers for free from sciencedirect, ieee, wiley, springer, nature and others

quillbot's paraphrasing tool is trusted by millions worldwide to rewrite sentences, paragraphs, or articles using state-of-the-art ai.

proceedings of the national academy of sciences (pnas), a peer reviewed journal of the national academy of sciences (nas) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.