@book{6870,
	author = {Klein, Felix, and Rosemann, W.},
	title = {Vorlesungen über Nicht-euklidische Geometrie,},
	publisher = {J. Springer,},
	year = {1928.},
	series = {Die Grundlehren der Mathematischen Wissenschaften in Einzeldarstellungen ...},
	address = {Berlin,}
}