Oswald, Nicola M. R.; Steuding, Jörn J. (1 July 2014). "Complex continued fractions: early work of the brothers Adolf and Julius Hurwitz". Archive for History of Exact Sciences. 68 (4): 499–528. doi:10.1007/s00407-014-0135-7. ISSN1432-0657. S2CID123512496.
Oswald, Nicola M. R.; Steuding, Jörn J. (1 July 2014). "Complex continued fractions: early work of the brothers Adolf and Julius Hurwitz". Archive for History of Exact Sciences. 68 (4): 499–528. doi:10.1007/s00407-014-0135-7. ISSN1432-0657. S2CID123512496.
Oswald, Nicola M. R.; Steuding, Jörn J. (1 July 2014). "Complex continued fractions: early work of the brothers Adolf and Julius Hurwitz". Archive for History of Exact Sciences. 68 (4): 499–528. doi:10.1007/s00407-014-0135-7. ISSN1432-0657. S2CID123512496.