• Conférences de rentrée 2009, ENS Cachan, Paris, france, September 8, 2009
  Logiques et automates sur les nombres réels et entiers, avec applications en vérification assistée par ordinateur
• Theorietag "Automaten und Formale Sprachen", October, 4-6, 2001, Magdeburg, Germany
  Completion of codes
• Thematic term on semigroups, algorithms, automata and languages, School on automata and languages, June 4 - 8, 2001, Coimbra, Portugal
  On Cobham's theorem
• Maurice Boffa's 60th birthday Workshop, March 23-25, 2000, Mons, Belgium
  Automata and numeration systems
• Seminar at the I.U.T of Metz, Department of Computer Science, March 25, 1999, Metz, France
  Maximal bifix codes
• DIMACS Workshop on Codes and Trees: Algorithmic and Information Theoretic Approaches, October 5 - 7, 1998, DIMACS Center, Rutgers University, Piscataway, New Jersey
  Codes : a Language Theoretic Approach