1. LCC; CNRS and Université de Toulouse; UPS; INP; F-31077 Toulouse France
2. Faculty of Electrical Engineering and Computer Science & MANSiD Research Center; Stefan cel Mare University; 13, Str. Universitatii Suceava 720229 Romania
3. LAAS; CNRS & Université de Toulouse; INSA; UPS; F-31077 Toulouse France
4. LPP-CIRIMAT; CNRS & Université de Toulouse III; 31062 Toulouse France