springer在线期刊和图书
国内第一个学术图片知识库
自动检测和更新可以访问的学术镜像网址
PubMed® comprises more than 33 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.
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。
OA期刊文献检索系统
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