A computer search for planar substitution tilings with n-fold rotational   symmetry
  We describe a computer algorithm that searches for substitution rules on a set of triangles, the angles of which are all integer multiples of {\pi}/n. We find new substitution rules admitting 7-fold rotational symmetry at many different inflation factors. 
Franz G\"ahler, Eugene E. Kwan, Gregory R. Maloney
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