GAUSS an SOPHIE GERMAIN, 1807 April 30
Nachtraege zur reinen Mathematik Bd. 10 Abt 1, GDML_Books, (1917), p. 70 / Harvested from
Access to full text 
@article{PPN236018647+dmdlog45,
     title = {GAUSS an SOPHIE GERMAIN, 1807 April 30},
     booktitle = {Nachtraege zur reinen Mathematik Bd. 10 Abt 1},
     series = {GDML\_Books},
     year = {1917},
     pages = {70},
     url = {http://dml.mathdoc.fr/item/PPN236018647+dmdlog45}
}

 (éd.). GAUSS an SOPHIE GERMAIN, 1807 April 30, dans Nachtraege zur reinen Mathematik Bd. 10 Abt 1, GDML_Books,  (1917), p. 70. http://gdmltest.u-ga.fr/item/PPN236018647+dmdlog45/