1. Laboratoire Ondes et Milieux Complexes; UMR 6294, CNRS-Université du Havre; 53 rue Prony BP540 76058 Le Havre France
2. Department of Mechanical Engineering; University of Canterbury; Private Bag 4800 Christchurch New Zealand
3. Scion; Private Bag 3020 Rotorua Mail Centre; Rotorua 3046 New Zealand