Affiliation: | 1. Department of Mathematics, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece;2. Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093-0411, USAn;1. Claudia Califano is with DIAG, Università di Roma, via Ariosto 25, Roma 00184, Italy;2. Emeric Scharbarg, Nicolas Magdelaine and Claude H. Moog are with LS2N, UMR CNRS 6004, BP 92101, 44321 Nantes Cedex 3, France |