@article{GDZPPN002241137, title = {Zur Theorie der Bessel'schen Functionen}, journal = {Mathematische Annalen}, volume = {3}, year = {1871}, pages = {475-487}, zbl = {03.0221.04}, url = {http://dml.mathdoc.fr/item/GDZPPN002241137} }
Lommel. Zur Theorie der Bessel'schen Functionen. Mathematische Annalen, Tome 3 (1871) pp. 475-487. http://gdmltest.u-ga.fr/item/GDZPPN002241137/