1. The undecidability of the domino problem;Berger;Mem. Amer. Math. Soc.,1966
2. On the presence of periodic configurations in Turing machines and in counter machines;Blondel;Theoret. Comput. Sci.,2002
3. Ergodic Theory and Topological Dynamics;Brown,1976
4. Recurrence in infinite words, Symposium on Theoretical Aspects of Computer Science (STACS 2001);Cassaigne,2001
5. An aperiodic set of 13 Wang tiles;Čulik;Discrete Appl. Math.,1996