@book{7677,
	author = {Bieberbach, Ludwig,},
	title = {Theorie der differentialgleichungen;},
	publisher = {J. Springer,},
	year = {1926.},
	series = {Die grundlehren der mathematischen wissenschaften ... bd. VI},
	address = {Berlin,},
	edition = {2. neubearb. aufl.}
}