GAUSS an HANSEN 18 März 11 .
Theoretische Astronomie Bd. 7, GDML_Books, (1906), p. 436 / Harvested from
Access to full text 
@article{PPN236008730+dmdlog116,
     title = {GAUSS an HANSEN 18 M\"arz 11 .},
     booktitle = {Theoretische Astronomie Bd. 7},
     series = {GDML\_Books},
     year = {1906},
     pages = {436},
     url = {http://dml.mathdoc.fr/item/PPN236008730+dmdlog116}
}

 (éd.). GAUSS an HANSEN 18 März 11 ., dans Theoretische Astronomie Bd. 7, GDML_Books,  (1906), p. 436. http://gdmltest.u-ga.fr/item/PPN236008730+dmdlog116/