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Blanchard, Devaney & Keen (2004), p. 38: «The shift map is without doubt the fundamental object in symbolic dynamics.» Blanchard, Paul; Devaney, Robert L.; Keen, Linda (2004), "Complex dynamics and symbolic dynamics", in Williams, Susan G. (ed.), Symbolic Dynamics and its Applications, Proceedings of Symposia in Applied Mathematics, vol. 60, Providence, RI: American Mathematical Society, pp. 37—60, doi:10.1090/psapm/060/2078845, MR2078845.
Blanchard, Devaney & Keen (2004), p. 38: «The shift map is without doubt the fundamental object in symbolic dynamics.» Blanchard, Paul; Devaney, Robert L.; Keen, Linda (2004), "Complex dynamics and symbolic dynamics", in Williams, Susan G. (ed.), Symbolic Dynamics and its Applications, Proceedings of Symposia in Applied Mathematics, vol. 60, Providence, RI: American Mathematical Society, pp. 37—60, doi:10.1090/psapm/060/2078845, MR2078845.