Two recommendations:

> Senechal, Marjorie. *Quasicrystals and geometry*. Cambriged Univ Press, 1996.
Review by Charles Radin in the *AMS Notices*: [PDF download](http://www.ams.org/notices/199604/radin.pdf).
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<img src="https://i.sstatic.net/RhorE.png" width="240" />
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> Baake, Michael. "A guide to mathematical quasicrystals." *Quasicrystals*. Springer Berlin Heidelberg, 2002. 17-48. ([arXiv prepub link](http://arxiv.org/abs/math-ph/9901014).)
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![Fig.13.2][2]
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Maximum entropy equals $\frac{1}{3} \log 2$.


  [1]: https://i.sstatic.net/RhorE.png
  [2]: https://i.sstatic.net/CAH4O.png