DOAJ Directory of Open Access Journals开放存取期刊的索引平台,提供高质量、同行评议期刊 DOAJ is a unique and extensive index of diverse open access journals from around the world, driven by a growing community, committed to ensuring quality content is freely available online for everyone.
CERN 文档服务 CERN Document Server超过65万篇物理学及相关学科的论文、预印本等全文 Access articles, reports and multimedia content in HEP
bioRxiv.org bioRxiv.org为生物学家专有的预印本文献库 bioRxiv - the preprint server for biology, operated by Cold Spring Harbor Laboratory, a research and educational institution
Sciendo Sciendo为组织和个人作者提供出版服务和解决方案,目前出版大约和其他机构拥有的约600种期刊 Publish, distribute and make your research globally recognized. Discover our services for scholarly journals, books and conference proceedings.
美国国家环境出版物 U.S. Environmental Protection Agency美国环境保护署提供出版物搜索、预览和下载等服务 Website of the U.S. Environmental Protection Agency (EPA). EPA's mission is to protect human health and the environment.