List of citations in Numdam for : Repetitive strings are not context-free

RAIRO. Informatique théorique, Volume 16 (1982) no. 3, pp. 191-199.

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Volume 41 (2007) no. 4, pp. 411-424.

Publications du Département de mathématiques (Lyon), no. 2B (1985), pp. 21-36.