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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.

maximizing the impact of research through openness. because science works best when research is open.

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

intechopen is a leading global publisher of journals and books within the fields of science, technology and medicine. we are the preferred choice of over 60,000 authors worldwide.

scientific research publishing is an academic publisher with more than 200 open access journal in the areas of science, technology and medicine. it also publishes academic books and conference proceedings.

search and explore the millions of quality, peer-reviewed journal articles published under the taylor & francis and routledge imprints.

open access publisher of peer-reviewed scientific articles across the entire spectrum of academia. research network for academics to stay up-to-date with the latest scientific publications, events, blogs and news.

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

the world’s largest collection of open access research papers