1. LIAFA, Universite Paris Diderot -- Paris 7 & CNRS & University of Tokyo & Technische Universitat Munchen, Paris, Tokyo, Munich, Germany
2. LIGM, Universite Paris-Est & CNRS, Paris, France
3. Royal Holloway University of London & LIGM, Universite Paris-Est & LIAFA, Universite Paris Diderot -- Paris 7 & CNRS, London, United Kingdom
4. LIAFA, Universite Paris Diderot -- Paris 7 & CNRS, Paris, France