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BASE (Bielefeld Academic Search Engine) is one of the world's largest search engines for scientific web documents. The index comprises over 100 million documents from over 5,000 sources. In about 60% of the documents indexed in BASE, the full texts are freely accessible (Open Access). The BASE search engine is operated by Bielefeld University Library.


BASE





Google Scholar is Google's search engine for scientific literature.


Google Scholar




PLOS ONE is an integrative Open Access journal community that works together to promote science for the benefit of society. The published research is multidisciplinary and often interdisciplinary. Over 200 subject areas are covered.


PLOS ONE




The DOAJ (Directory of Open Access Journals) comprises approximately 12,000 Open Access journals from all areas of science, technology, medicine, the social sciences and the humanities.


DOAJ




Academia.edu ist eine Plattform f├╝r Wissenschaftler zum Austausch von Forschungsarbeiten. Es muss sich einmalig mit einer E-Mail Adresse registriert werden. Die kostenfreie Nutzung beschr├Ąnkt sich auf einzelne Angebote von Academia.


Academia




The German Digital Library (DDB) provides free access to Germany's cultural and scientific heritage via the Internet.


DDB