1. Department of Industrial EngineeringUniversity of Perugia Via G. Duranti 67 06125 Perugia Italy
2. Department of Mechanical and Industrial EngineeringNorwegian University of Science and Technology (NTNU) Richard Birkelands vei 2b 7491 Trondheim Norway
3. University of Padova CISAS, Via Venezia 15 35131 Padova Italy