OPUS is a publication and document server for works produced at the University of Siegen or are associated with it. This is where, for example, articles, working papers, technical reports, dissertations, or conference materials are published. The materials provided are open access documents and are available to the public free of charge and without barriers.

Content can be searched for specifically or displayed according to various criteria via the respective tabs:

  • Collections: Each publication is assigned to a collection; the collections can be filtered according to various criteria.
  • Publications: The "Browse by" function allows you to view all publications by institution/person/title/literature type/year of publication/keywords. You can also search for publications using your own criteria via the search fields.
  • People: "Browse by" lists all people by name or by their institution. The search fields allow you to search for people using your own criteria.
  • Institution: Browse by" lists all facilities. Facilities can be searched for using your own criteria via the search fields.

Search Tips

All entered search terms are always searched. Other common word endings for plural, past tense, and similar forms are automatically taken into account.

Boolean Operators

The following operators can be used to combine terms (uppercase required)

  • AND: ll search terms must be included in the number of hits: cats AND dogs.
  • OR: One of the search terms must be: cats OR dogs
  • NOT: The following search term must not be included: cats NOT dogs.

Truncation / Wildcard

An asterisk (*) replaces either one or any number of following characters: Demo* finds democracy, demonstration, demolish, etc..

Phrase search

If search terms are enclosed in quotation marks “”, the exact sequence (including spaces) will be searched for. A + before a word will only find that specific spelling. A – excludes that word..

Combination of search fields

The search always returns all terms within a search field. Multiple search fields can be combined:

  • AND finds matches that contain all terms from the combined fields.
  • OR finds matches that are either in one field, or in the other, or in both fields.
  • NOT finds matches that are not in the previous field but in the following field.