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@article{MAN_1880__16_156884, author = {Lommel}, title = {Zur {Theorie} der {Bessel'schen} {Functionen.}}, journal = {Mathematische Annalen}, pages = {183--208}, publisher = {mathdoc}, volume = {16}, year = {1880}, zbl = {12.0773.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1880__16_156884/} }
Lommel. Zur Theorie der Bessel'schen Functionen.. Mathematische Annalen, Tome 16 (1880), pp. 183-208. http://geodesic.mathdoc.fr/item/MAN_1880__16_156884/