@book {9783816983330, title = "Das Prinzip Einfachheit", isbn = "9783816983330", edition = "2", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783816983330", url = "https://content-select.com/de/portal/media/view/5b56fc75-fbc0-43d8-a8d2-5d67b0dd2d03", publisher = "expert verlag", }