@book{53345,
	author = {Schubert, Hermann,},
	title = {Elementare Arithmetik und Algebra},
	publisher = {Project Gutenberg,},
	year = {2004},
	address = {Salt Lake City, UT :},
	note = {Release date is 2004-04-06},
	url = {https://www.gutenberg.org/ebooks/11925}
}