1. Department of Applied Mechanics, Budapest University
of Technology and Economics, H-1521 Budapest, Hungary, inspi@mm.bme.hu
2. Mechanical Engineering Department, Indian Institute
of Technology - Kanpur, Kanpur, U.P., 208016, India
3. Dipartimento di Elettronica e Informazione, Politecnico
di Milano, Via Ponzio, 34/5-20133, Milano, Italy
4. Department of Applied Mechanics, Budapest University
of Technology and Economics, H-1521 Budapest, Hungary
5. Department of Engineering Mathematics, University of
Bristol, Queen's Building, University Walk, Bristol BS8 1TR, UK