GAUSS an OLBERS, 1838 April 11
Nachtraege zur Physik, Chronologie und Astronomie Bd.11, Abt.1, GDML_Books, (1927), p. 444 / Harvested from
Access to full text 
@article{PPN236020595+dmdlog324,
     title = {GAUSS an OLBERS, 1838 April 11},
     booktitle = {Nachtraege zur Physik, Chronologie und Astronomie Bd.11, Abt.1},
     series = {GDML\_Books},
     year = {1927},
     pages = {444},
     url = {http://dml.mathdoc.fr/item/PPN236020595+dmdlog324}
}

 (éd.). GAUSS an OLBERS, 1838 April 11, dans Nachtraege zur Physik, Chronologie und Astronomie Bd.11, Abt.1, GDML_Books,  (1927), p. 444. http://gdmltest.u-ga.fr/item/PPN236020595+dmdlog324/