1. D.J. Cumberland, R.J. Crawford, The packing of particles, in: J.C. Williams, T. Allen (Eds.), Handbook of Powder Technology, Vol. 6, Elsevier, Amsterdam, 1987.
2. P.G. DeGennes, in: The Physics of Liquid Crystals, Clarendon Press, Oxford, 1974.
3. B.B. Mandelbrot, in: The Fractal Geometry of Nature, Freeman, New York, 1983.
4. Plato, Apollonius, and Klein: playing with spheres
5. Apollonian arrangements of spheres in d-dimensional space