Affiliation: | Department of Aerospace Engineering and Mechanics, 107 Akerman Hall, University of Minnesota, Minneapolis, MN 55455, USA e-mail: james@umn.edu, US Dipartimento di Ingegneria, Università di Ferrara, Via Saragat 1, 44100 Ferrara, Italy e-mail: rizzoni@ing.unife.it, IT
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