@book{70654,
	author = {Frischauf, Johannes,},
	title = {Elemente der Absoluten Geometrie},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-08-26},
	url = {https://www.gutenberg.org/ebooks/29806}
}