GAUSS an OLBERS, 1807 Juli 21
Nachtraege zur reinen Mathematik Bd. 10 Abt 1, GDML_Books, (1917), p. 74 / Harvested from
Access to full text 
@article{PPN236018647+dmdlog46,
     title = {GAUSS an OLBERS, 1807 Juli 21},
     booktitle = {Nachtraege zur reinen Mathematik Bd. 10 Abt 1},
     series = {GDML\_Books},
     year = {1917},
     pages = {74},
     url = {http://dml.mathdoc.fr/item/PPN236018647+dmdlog46}
}

 (éd.). GAUSS an OLBERS, 1807 Juli 21, dans Nachtraege zur reinen Mathematik Bd. 10 Abt 1, GDML_Books,  (1917), p. 74. http://gdmltest.u-ga.fr/item/PPN236018647+dmdlog46/