@book{4888,
	author = {Wattenberg, Diedrich and Archenhold Sternwarte Berlin-Treptow and Archenhold, Friedrich Simon},
	title = {Ergebnisse der Potsdamer Sonnenfinsternis-Expedition  vom 9. Mai 1929},
	publisher = {Carl Fr. Berg, vorm J. Windolff},
	year = {1932  },
	address = {Berlin SW 68},
	url = {https://www.astw.de/publikationen/weltall/pdf/weltall_jg_31.pdf}
}