@book{4428,
	author = {Archenhold Sternwarte Berlin-Treptow and Archenhold, Friedrich Simon},
	title = {Das Weltall},
	publisher = {Wilhelm Grewe},
	year = {1927},
	address = {Berlin SW 68},
	url = {https://www.astw.de/publikationen/weltall/pdf/weltall_jg_26.pdf}
}