Open Access Library (OALib)

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知识学习学术研究

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 ac……

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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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百度学术

百度学术搜索，是一个提供海量中英文文献检索的学术资源搜索平台，涵盖了各类学术期刊、学位、会议论文，旨在为国内外学者提供最好的科研体验。

iData-知识检索

iData知识检索—免费下载学术文献,免费论文下载。