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Papers relating to this video…
Nombres algébriques et substitutions: http://archive.numdam.org/item/BSMF_1982__110__147_0/
Algebraic numbers, free group automorphisms and substitutions on the plane: https://doi.org/10.1090/S0002-9947-2011-05188-3
CORRECTION: At 5:09 the number in the animation should be 17.
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