How can I cite documents on the OPUS server and what is an URN?

Electronic publications are to be cited as in the ISO 690-2. You can find more information on this topic on the ”Wissenschaftsserver der Universität des Saarlandes Scidok” and in the project "Digitale Dissertationen im Internet".

Citation an electronic document using the ISO 690-2 (whereby the date means the last access to the online ressource) should look like this:

  1. Bittner, Torsten
    Climate change impacts on habitats and biodiversity : From environmental envelope modelling to nature conservation strategies [online]
    Bayreuth, Univ., Diss., 2012 [zitiert 05.03.2012]
  2. Siegert, Nadine:
    Kuduru - Musikmachen ohne Führerschein [online]
    Ethnoscripts 10 (2008) pp. 102 - 124 [zitiert 05.03.2012]


An URN is produced for all documents - Uniform Resource Name.
The URN is given in order to secure that the dissertation is permanently accessible in the near future. The URN describes the physical place of storage of a ressource. The URN does not describe where a document is stored. It is a link to the link-resolver of the german national library, which then delivers the URL to the corresponding URN. This has the advantage that the URN is valid even if the place where the document is kept should change to a different location (e.g. with a change of server).

Please enter the URN wherever you would like to cite the document.
Unfortunately the webbrowser cannot resolve the URN as a webadress. The URN’s must be translated by a link-resolver. The service is achieved via the resolving service of the german national library:

The URN must be wrapped as a URL so that the webbrowser can then send the link to the link-resolver via the URL. In order to access the document the link to the resolver must be prepended in front of the URN.

URN: urn:nbn:de:bvb:703-opus-....