1. Combinatorics of words;Choffrut,1995
2. Combinatorics on Words;Lothaire,1983
3. Repetitions in the Fibonacci infinite word;Mignosi;RAIRO Theor. Inform. Appl.,1992
4. A periodicity theorem on words and applications;Mignosi,1995
5. Periodicity and golden ratio;Mignosi;Theoret. Comput. Sci.,1998