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

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annual reviews is a nonprofit publisher dedicated to synthesizing and integrating knowledge for the progress of science and the benefit of society.

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.

jstor is a digital library of academic journals, books, and primary sources.

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