Hi Jerson,

there is this unpaywall project, provides alternative download locations for scientific papers. Have a look at their website: http://unpaywall.org/

They also developed a browser plugin to show you whether a specific article is available.

Yes. You may search OpenDoar where you can find scientific papers. Open-Doar basically directory of open repositories where you can search or find material at glance, that number goes up to 3513 repositories across the world. The second one is DOAJ (Directory of Open Access Journals) the profile content 11,260 Journals, 8,205 searchable at Article level, 123 Countries, and 2,960,346 Articles.

Hello,

Digital content made publicly available via the University of Arizona Campus Repository is open access and can be viewed and downloaded without registration or login. Anyone is welcome to register for the repository in order to set up search alerts for new content, submit content to collections when authorized, and manage collections when authorized. You can find it here:

http://arizona.openrepository.com/arizona/submit

Good luck!

Sci-hub is a nice website to download the paper and proceedings by free of cost.

Science Direct at https://www.sciencedirect.com/ is another good resource for open access scientific articles.

Search engines are effective tools for research; following Search Engines support for Open Access scientific papers:

CORE(https://core.ac.uk/search) - allow keyword and semantic search of open access articles. BASE(https://www.base-search.net/about/en/) is one of the world's most voluminous search engines especially for academic open access web resources.

Someone already give you a good advice. OpenDoar lists more than 3500 open repositories where you can search for articles that have been deposited there. Just choose the country or field that interests you and check the repositories presented. www.opendoar.org/

Second possibility is DOAJ (Directory of Open Access Journals) wich allows you to see all the scientific journals that have open access to the articles they publish. Again, select the field or subject that interests you and check the journals provided as a result. https://doaj.org/

One good exemple of journals with open access is Plos One. You've got scientific information for free from one of the journals on top of Impact Factor ranking. http://journals.plos.org/plosone/

You may also contact your library as most libraries compile list of OA sites for their patrons

Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines

https://scholar.google.com

• Google Scholar
• Directory of Open Access Journals
• Directory of Open Access Books
• Taylor and Francis

I agree with Dr. Paulo. In addition, google scholar is also very good as an OA site (search tool) for downloading scientific papers.

I agree with Dr. Paulo. In addition, google scholar is also very good as an OA site (search tool) for downloading scientific papers.

Use google scholar and then took the DOI use in SCI-HUB.

the is the best solution for everyone.

Use Google Scholar, and if the full text is not available then use Sci-Hub (search through DOI or article title). Mahadi Hasan is absolutely right.