Baake, Michael; Grimm, Uwe and Scheffer, Max
Colourings of planar quasicrystals.
Journal of Alloys and Compounds, 342(1-2) pp. 195–197.
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The investigation of colour symmetries for periodic and aperiodic systems consists of two steps. The first concerns the computation of the possible numbers of colours and is mainly combinatorial in nature. The second is algebraic and determines the actual colour symmetry groups. Continuing previous work, we present the results of the combinatorial part for planar patterns with n-fold symmetry, where n=7, 9, 15, 16, 20, 24. This completes the cases with phi(n)<=8, where phi is Euler's totient function.
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