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—免费下载学术文献,免费论文下载。
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.
