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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





TIB Hannover (Leibniz Information Centre for Science and Technology and University Library) is the German National Library of Science and Technology and provides science, research and business with literature and information.


TIB Hannover


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