I. Zusätze zur Theoria motus
Theoretische Astronomie Bd. 7, GDML_Books, (1906), p. 291 / Harvested from
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     title = {I. Zus\"atze zur Theoria motus},
     booktitle = {Theoretische Astronomie Bd. 7},
     series = {GDML\_Books},
     year = {1906},
     pages = {291},
     url = {http://dml.mathdoc.fr/item/PPN236008730+dmdlog22}
}

 (éd.). I. Zusätze zur Theoria motus, dans Theoretische Astronomie Bd. 7, GDML_Books,  (1906), p. 291. http://gdmltest.u-ga.fr/item/PPN236008730+dmdlog22/