1. Asplund, E., Grünbaum, B.: On the geometry of Minkowski planes. Enseign. Math. (2) 6 (1960), 299–306 (1961)
2. Berger, M.: Geometry I. Springer-Verlag, New York (1987)
3. Grace, J.H.: Circles, spheres, and linear complexes. Trans. Cambridge Philosophical Soc. 14, 153–190 (1898)
4. Grace, J.H.: Tetrahedra in relation to spheres and quadrics. Proc. London Math. Soc. 52–17, 259–271 (1918)
5. Johnson, R.A.: Advanced Euclidean Geometry. Dover Publication, New York (1960)