1. Berstel, J.: Axel Thue’s papers on repetition in words: a translation, Publications du LaCIM, Université du Québec á Montréal 20 (1995)
2. Berstel, J., Karhumäki, J.: Combinatorics on words: a tutorial. Bulletin of the EATCS 79, 178–228 (2003)
3. Brandenburg, F.-J.: Uniformly growing k-th power-free homomorphisms. Theoret. Comput. Sci. 23, 69–82 (1983)
4. Carpi, A.: On the repetition threshold for large alphabets, Dipartimento di Matematica e Informatica dell’Università di Perugia, Tech. rep. no. 5-2006 (2006)
5. Crochemore, M., Goralcik, P.: Mutually avoiding ternary words of small exponent. Int. J. Alg. Comp. 1, 407–410 (1991)