1. Aubrun, N., Sablik, M.: An order on sets of tilings corresponding to an order on languages. In: 26th International Symposium on Theoretical Aspects of Computer Science (STACS 2009), vol. 3, pp. 99–110 (2009)
2. Beal, M.P.: Codage Symbolique. Masson, Paris (1993)
3. Berger, R.: The Undecidability of the Domino Problem. Am. Math. Soc., Providence (1966)
4. Boyle, M.: Open problems in symbolic dynamics. Contemp. Math. 468, 69–118 (2008)
5. Dale, M.: Nonrecursive tilings of the plane. II. J. Symb. Log. 39(2), 286–294 (1974)