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Welcome to the official site of the electronic journal.

We offer:
- high-quality peer-reviewing,
- information widely available at the lowest possible costs:
- free access to WWW version,
- subscription for paper (hard) copies only – see  cover no. 1/2011 on the left,
- to use the advantages of WWW:
- publication of (colour) images, movie clips, sound and similar files,
- on-line submission,
- abstracting in various databses.

Creators of e-PS support free access to knowledge worldwide by making the articles published in e-PS available online, free of charge. A hard copy edition is available upon subscription. By subscribing to the hard copy edition, you can help us to continue providing open-access to the web edition.



Latest contributions:


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Abstracted/indexed by:

      Chemical abstracts
     Directory of Open Access Journals
      Art and Archaeology Technical Abstracts
     CSA Technology Research Database