@article{PPN236020595+dmdlog248, title = {BESSEL an OLBERS, 1820 August 3}, booktitle = {Nachtraege zur Physik, Chronologie und Astronomie Bd.11, Abt.1}, series = {GDML\_Books}, year = {1927}, pages = {327}, url = {http://dml.mathdoc.fr/item/PPN236020595+dmdlog248} }
(éd.). BESSEL an OLBERS, 1820 August 3, dans Nachtraege zur Physik, Chronologie und Astronomie Bd.11, Abt.1, GDML_Books, (1927), p. 327. http://gdmltest.u-ga.fr/item/PPN236020595+dmdlog248/