Sci-Hub（2）

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

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

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.