[1] Politecn Torino, Dept Control & Comp Engn, Turin, Italy
[2] Delft Univ Technol, Cognit Robot CoR Dept, Delft, Netherlands
[3] Univ Naples Federico II, PRISMA Lab DIETI Dipartimento Ingn Elettr & Tecno, Naples, Italy
[4] German Aerosp Ctr, Inst Robot & Mechatron, Weling, Germany
[5] Univ Pisa, Dept Informat Engn, Pisa, Italy
[6] Univ Pisa, Ctr E Piaggio, Pisa, Italy