Dragutin Svrtan and Darko Veljan, "Non-Euclidean versions of some classical triangle inequalities", Forum Geometricorum 12 2012 , 197—209 | |
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Siehe Gericke: Antike und Orient | Berlin, New York: DE GRUYTER |
"On the Equations and Properties: 1 of the System of Circles Touching Three Circles in a Plane; 2 of the System of Spheres Touching Four Spheres in Space; 3 of the System of Circles Touching Three Circles on a Sphere; 4 of the System of Conics Inscribed to a Conic, and Touching Three Inscribed Conics in a Plane" | Verlag Harri German, 5th edition, Thun and Frankfurt 2001, p |
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"On the areas of cyclic and semicyclic polygons" PDF | See in particular the bottom of p |