[1] Polytech Porto, Inst Engn, Dept Elect Engn, P-4200072 Oporto, Portugal
[2] Cankaya Univ, Fac Arts & Sci, Dept Math & Comp Sci, Ankara, Turkey
[3] Inst Space Sci, Magurele, Romania
[4] Hohai Univ, Dept Engn Mech, Nanjing, Jiangsu, Peoples R China
[5] Univ Bordeaux, Lab IMS, Grp Automat, CNRS,UMR 5218, Bordeaux, France