@article{PPN236020595+dmdlog97, title = {27. GAUSS an OLBERS, 1838 November 20}, booktitle = {Nachtraege zur Physik, Chronologie und Astronomie Bd.11, Abt.1}, series = {GDML\_Books}, year = {1927}, pages = {113}, url = {http://dml.mathdoc.fr/item/PPN236020595+dmdlog97} }
(éd.). 27. GAUSS an OLBERS, 1838 November 20, dans Nachtraege zur Physik, Chronologie und Astronomie Bd.11, Abt.1, GDML_Books, (1927), p. 113. http://gdmltest.u-ga.fr/item/PPN236020595+dmdlog97/