Bielefeld Academic Search Engine

The Bielefeld Academic Search Engine (BASE), operated by the Bielefeld University Library, is one of the world’s most voluminous search engines especially for academic open-access web resources. More and more repository servers come into being which use the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) for providing their contents. BASE collects, normalizes, and indexes these data. BASE provides more than seventy million documents from more than three thousand sources. You can access the full texts of about 70 percent of the indexed documents.