Bibliography
- Fenchel, Werner; Nielsen, Jakob; edited by Asmus L. Schmidt (2003), Discontinuous groups of isometries in the hyperbolic plane, De Gruyter Studies in mathematics, 29, Berlin: Walter de Gruyter & Co.
- Nielsen, Jakob (1986), Hansen, Vagn Lundsgaard, ed., Jakob Nielsen: collected mathematical papers. Vol. 1, Contemporary Mathematicians, Boston, MA: Birkhäuser Boston, ISBN 978-0-8176-3140-6, MR 865335, http://books.google.com/books?id=RQbvAAAAMAAJ
- Nielsen, Jakob (1986), Hansen, Vagn Lundsgaard, ed., Jakob Nielsen: collected mathematical papers. Vol. 2, Contemporary Mathematicians, Boston, MA: Birkhäuser Boston, ISBN 978-0-8176-3151-2, MR 865336, http://books.google.com/books?id=UFKRQwAACAAJ
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