Sci-Hub（2）

Open Access Library (www.oalib.com) is an academic search engine and publisher. You can download research papers for free and submit your paper to it. It is a shared academic database.

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The first pirate website in the world to open mass and public access to tens of millions research papers

文献部落是一个免费下载文献的学术导航网站，汇总最新免费下载国内外文献的网站，为广大研究生提供最便捷的文献下载方法