English: This page is an automatically produced print version (Pdf) of the page from the German Wikiversity and is as such under the CC-by-sa 3.0-licence (see the licence declaration there). For images used, the licences might be slightly different and are listed explicitly in an appendix. This print version is produced from a latex file and produces a printable version which is much better than the Pdf-file generated by the Pdf-button. For attribution of used images, see the section "Abbildungsverzeichnis" within the document.