Informationskomptentenz Online - University Library

Examples - Special search engines

In particular, we would like to introduce the two special search engines Google Scholar and BASE:

Aspects	Google Scholar	BASE (Bielefeld Academic Search Engine)
Provider	Commercial provider: Google	Public provider: Bielefeld University Library
Description	Especially for searching scientific literature, e.g. book titles, journal articles, technical papers Cooperation with scientific publishers for access to content behind the paywall in the "Deep Web” Contains 100-106 million documents, evaluates seminar, master, diploma, bachelor, master and doctoral theses, as well as books, summaries and articles from academic publishers, professional associations, preprints, universities and other educational institutions (see https://scholar.google.de/intl/en/scholar/about.html	search engine for scientific documents freely accessible in the sense of Open Access Access to documents in "Deep Web" indexes about 80 million documents, university theses, preprints, journal articles, etc. from over 4000 document servers (as of 2016) https://www.base-search.net/about/de/index.html
Advantages	In the campus area link to the literature of the University Library	Search refinement by authors, keywords, DDC classification, years of publication, sources, languages and document type Browsing by DDC Classification and Document Type Editorial selection of sources (list of sources can be viewed) 70% of the documents are available in full text
Disadvantages	Many bibliographic references, fewer full texts (45-50%) No list of sources developed Completeness is not guaranteed Only limited search refinement possible Incorrectly indexed documents Search results vary and are not reproducible	Search is limited to metadata of documents, the full texts are not searched.