免费文献检索与下载资源
1. CORE： https://core.ac.uk/ CORE is a not-for-profit service delivered by the Open University and Jisc. 可免费检索208,929,220篇论文。
2. libgen: libgen.is
1. CORE： https://core.ac.uk/ CORE is a not-for-profit service delivered by the Open University and Jisc. 可免费检索208,929,220篇论文。
2. libgen: libgen.is