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When downloading a document, please note that all publications are under international copyright restrictions. You may use the contents of these publications, but you are not allowed to republish it or to modify its contents or list of authors. Usage of contents of the presented documents always requires a quotation citing the journal, number, year, page and author(s) of the article where information was extracted from. The publisher of each article owns its copyright for reprinting. Reprints can be ordered (if still available) at the publishing house.

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