1. Alexander S., McTague J., Phys. Rev. Lett. 41 (1978) 702
2. Ammann (1977) cited in “Tilings and Patterns”, ed. B. Grünbaum, G.C. Shephard (Freeman & Co. New York 1985)
3. D. Levine, P.J. Steinhardt, J. Non-Cryst. Sol. 75 (1985) 85
4. Ashcroft N.W., Mermin N.D. “Solid State Physics” (Saunders Coll. Publ. 1976)
5. See e.g. Baake M. (2002): Chapter 2 of this book. See also: Grimm U., Schreiber M. (2002) : Chapter 3 of this book