The Public Library of Science is a non-profit website, established on 200 1. It provides the results of nearly 34,000 researchers in 65,438+080 countries.

Scientific hub

This is a magical website, you can download documents for free, and you can download PDF format for free! Almost all Daniel who do scientific research know this hard-core platform.

Open-shelf borrowing

OALib has more than 4 million papers, including mathematics, chemistry, computer, humanities, engineering, biology, materials, medicine and humanities. All papers are free to download.

Seek68 literature museum

Seek68 Library's massive Chinese and foreign language database resource collection platform covers a comprehensive field, supports full-text reading and downloading, and provides help for difficult documents. There is no limit to the number of free and paid article downloads (the cost is very low).

DOAJ

DOAJ (Open Access Periodical Catalogue) was founded in 2003, which contains 6,543,800+4,000 periodicals and 4,760,000 high-quality literature resources and peer-reviewed articles in science, law and art.

Find articles

FindaRticles is a powerful search engine that can get free published documents. Most of the documents it collects can be read or printed for free, including medical journals.

Eric (name)

The website established by the U.S. Department of Education has more than 6.5438+0.3 million kinds of documents, including journal articles, books, comprehensive research reports, conference papers, technical reports, policy documents and so on. Resources rank first in the world, and many resources can be obtained for free.

Scientific opening-up

ScienceOpen is a company established in Berlin and Boston on 20 13, with 25,000 periodicals and 62 million scientific documents. You need to register as a website member to browse the full text for free. At the same time, it has advanced search function, and can find specific and suitable literature materials.

Library origin

This is a public service website that searches and downloads documents online. It claims to be a plan to help all mankind spread knowledge without copyright. There are more than 1 10,000 documents on the website, all of which are English original e-books and papers.

PubMed

Pubmed is a free web-based biomedical information retrieval system, which was developed by National Biotechnology Information Center (NCBI) in April 2000 and belongs to National Library of Medicine (NLM).