@misc{Neumann_Carl_(1832–1925)_Theorie_1867,
 author={Neumann, Carl (1832–1925)},
 copyright={Public Domain},
 address={Leipzig},
 howpublished={online},
 year={1867},
 publisher={B. G. Teubner},
 language={ger},
 language={ger},
 type={Text},
 title={Theorie der Bessel'schen Functionen : ein Analogon zur Theorie der Kugelfunctionen},
 URL={http://www.rcin.org.pl/Content/69077/PDF/WA35_18451_5937_Die-Entwickelung-3.pdf},
}