7. GAUSS an SCHUMACHER, 1816 April
Nachtraege zur reinen Mathematik Bd. 10 Abt 1, GDML_Books, (1917), p. 247 / Harvested from
Access to full text 
@article{PPN236018647+dmdlog118,
     title = {7. GAUSS an SCHUMACHER, 1816 April},
     booktitle = {Nachtraege zur reinen Mathematik Bd. 10 Abt 1},
     series = {GDML\_Books},
     year = {1917},
     pages = {247},
     url = {http://dml.mathdoc.fr/item/PPN236018647+dmdlog118}
}

 (éd.). 7. GAUSS an SCHUMACHER, 1816 April, dans Nachtraege zur reinen Mathematik Bd. 10 Abt 1, GDML_Books,  (1917), p. 247. http://gdmltest.u-ga.fr/item/PPN236018647+dmdlog118/