Eugenio Beltrami, Theoria fondamentale delgi spazil di curvatura constanta, Annali. di Mat., ser II 2 (1868), 232-255
Henri Poincaré (1882) "Théorie des Groupes Fuchsiens", Acta Mathematica v.1,p.1.First article in a legendary series exploiting half-plane model.On page 52 one can see an example of the semicircle diagrams so characteristic of the model.
Hershel M. Farkas and Irwin Kra, Riemann Surfaces (1980), Springer-Verlag, New York. ISBN 0-387-90465-4.
Jurgen Jost, Compact Riemann Surfaces (2002), Springer-Verlag, New York. ISBN 3-540-43299-X(See Section 2.3).
Saul Stahl, The Poincaré Half-Plane, Jones and Bartlett, 1993, ISBN 0-86720-298-X.
John Stillwell (1998) Numbers and Geometry,pp.100-104, Springer-Verlag,NY ISBN 0-387-98289-2 .An elementary introduction to the Poincaré half-plane model of the hyperbolic plane.
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