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H. Furstenberg . Disjointness in ergodic theory, minimal sets, and a problem in Diophantine approximation. Math. Systems Theory 1 (1967), 1–49.
R. M. Robinson . Undecidability and nonperiodicity for tilings of the plane. Invent. Math. 12 (1971), 177–209.
K. Schmidt and T. Ward . Mixing automorphisms of compact groups and a theorem of Schlickewei. Invent. Math. 111 (1993), 69–76.
R. Spatzier . Harmonic analysis in rigidity theory. Ergodic Theory and its Connections with Harmonic Analysis. Cambridge University Press, Cambridge, 1995, pp. 153–205.