@book {9783402198063, 
	title = "Die Zwettler Summe",
	author = "Häring, Nikolaus M",
	isbn = "9783402198063",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783402198063",
	url = "https://content-select.com/de/portal/media/view/60421704-bf10-4ae7-a9cf-5a28b0dd2d03",
	publisher = "Aschendorff Verlag",
	language = "ger",
}