1. Minimal forbidden words and symbolic dynamics;Béal,1996
2. A. Carpi, A. de Luca, Words and repeated factors, Séminaire Lotharingien de Combinatoire, B42l (1998) 24 pp, and in: D. Foata, G.-N. Han (Eds.) The Andrews Festschrif̀t, Springer, Berlin, 2001, pp. 231–251.
3. A. Carpi, A. de Luca, Words and special factors, Preprint 98/33, Dipartimento di Matematica dell'Università di Roma “‘La Sapienza”, 1998, Theoret. Comput. Sci., to appear.
4. Repetitions and boxes in words and pictures;Carpi,1999
5. Special factors, periodicity, and an application to Sturmian words;Carpi;Acta Inform.,2000