March 2016 : Antonio Restivo was invited by Marie-Pierre Beal and Dominique Perrin of LIGM at Université Paris-Est Marne la Vallée for one month (March 2016). 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.