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The provided documents on E-Periodica are freely available for non-commercial use in teaching, research and for private purposes. Individual files or print-outs of articles may be passed to other persons together with these terms and conditions and the proper indication of origin.

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We encourage the posting of links to pages of E-Periodica. Titles in E-Periodica can be accessed permanently by persistent link: http://doi.org/[DOI].

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DOI

Using a Digital Object Identifier (DOI) allows electronic documents to be referenced in a stable, globally unambiguous and non-location-dependent manner. It guarantees reliability in citing sources even if the Uniform Resource Locator (URL) changes. This is why DOIs are suitable for permanently guaranteed citation in scientific papers.

DOIs cannot be called up directly in a browser but are translated into URLs by a resolving service. The persistent resolution of these links is carried out by the International DOI Foundation (IDF).