xii, 310~p, ISBN 978-3-03719-087-6k,* Java freeware for creating sketches in both the Poincaré Disk and the Upper Half-Plane Models of Hyperbolic Geometry University of New Mexico* A short music video about the basics of Hyperbolic Geometry available at Youtube.
== External links ==* Java freeware for creating sketches in both the Poincaré Disk and the Upper Half-Plane Models of Hyperbolic Geometry University of New Mexico* "The Hyperbolic Geometry Song" A short music video about the basics of Hyperbolic Geometry available at YouTube.