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Apr 11, 2020 at 20:15 comment added Watson Just in case the link doesn't work at some point, the reference is APERIODIC ORDER AND QUASICRYSTALS: SPECTRAL PROPERTIES by DANIEL LENZ AND PETER STOLLMANN.
Sep 17, 2012 at 23:32 history answered Delio Mugnolo CC BY-SA 3.0