@book{PPN236007467, title = {Astronomische Abhandlungen Bd. 6}, series = {GDML\_Books}, year = {1874}, language = {lat}, url = {http://dml.mathdoc.fr/item/PPN236007467} }
(éd.). Astronomische Abhandlungen Bd. 6. GDML_Books (1874), http://gdmltest.u-ga.fr/item/PPN236007467/