1. Department of Aerospace Engineering, University of Illiois at Urbana-Champaign, Urbana, Illinois, USA
2. School of Applied Mathematical and Physical Sciences, National Technical University of Athens, Athens, Greece
3. Aerospace and Mechanical Engineering Department (LTAS), Université de Liège, Liège, Belgium
4. Department of Mechanics and Materials, Mediterranean University, Reggio Calabria, Italy