1. Automatic Sequences. Theory, Applications, Generalizations;Allouche,2003
2. Avoidable patterns in strings of symbols;Bean;Pac. J. Math.,1979
3. Axel Thue's papers on repetitions in words: a translation;Berstel;Publ. LaCIM,1995
4. The origins of combinatorics on words;Berstel;Eur. J. Comb.,2007
5. On Dejean's conjecture over large alphabets;Carpi;Theor. Comput. Sci.,2007