@book{33223,
	author = {Weigand, Hans-Georg||McCallum, William||Menghini, Marta||Neubrand, Michael||Schubring, Gert},
	title = {The Legacy of Felix Klein},
	url = {https://library.oapen.org/bitstream/20.500.12657/23022/1/1007139.pdf}
}