J. Berstel, Axel Thue's Papers on Repetitions in Words: a Translation, Number 20 in Publications du Laboratoire de Combinatoire et d'Informatique Mathématique, 1995.

J. Chalopin and P. Ochem, Dejean's conjecture and letter frequency, Mons Days of Theoretical Computer Science, 2006.

M. Crochemore, Sharp characterizations of squarefree morphisms, Theoretical Computer Science, vol.18, issue.2, pp.221-226, 1982.
DOI : 10.1016/0304-3975(82)90023-8

A. Khalyavin, The minimal density of a letter in an infinite ternary squarefree word is 883 3215, J. Integer Sequences, vol.10, issue.6, pp.7-13, 2007.

R. Kolpakov, G. Kucherov, and Y. Tarannikov, On repetition-free binary words of minimal density, Theoretical Computer Science, vol.218, issue.1, pp.161-175, 1999.
DOI : 10.1016/S0304-3975(98)00257-6

URL : https://hal.archives-ouvertes.fr/inria-00098692

P. Ochem, Letter frequency in infinite repetition-free words, Theoretical Computer Science, vol.380, issue.3, pp.388-392, 2007.
DOI : 10.1016/j.tcs.2007.03.027

C. Richard and U. Grimm, On the entropy and letter frequencies of ternary square-free words, Electron, J. Comb, vol.11, p.14, 2004.

Y. Tarannikov, The minimal density of a letter in an infinite ternary squarefree word is 0.2746, J. Integer Sequences, vol.5, issue.2, pp.2-2, 2002.

. Kl, Reprinted in Selected Mathematical Papers, pp.1-22, 1906.

]. A. Thue, ¨ Uber die gegenseitige Lage gleicher Teile gewisser Zeichenreihen, Norske vid, Selsk. Skr. Mat. Nat. Kl, vol.1, pp.1-67, 1912.