June 2013 : Professor Antonio Restivo was invited by Marie-Pierre Beal and Dominique Perrin for one month (june 2013). He has worked at several topics in combinatorics on words, which lead in particular to a chapter (Enumerative Combinatorics on Words) of the CRC Handbook ‘Enumerative Combinatorics’ (Miklos Bona editor). He has also interacted with several researchers at LIGM including Maxime Crochemore, Giuseppina Rindone and Francesco Dolce.