Jörg Schumacher
Department of Mechanical Engineering, 
P.O.Box 100565, TU Ilmenau, 
D-98684 Ilmenau, Germany

phone: +49-3677-692428
fax: +49-3677-692411
email: euromech586@tu-ilmenau.de

Bruno Eckhardt
Department of Physics
Philipps Universität Marburg
D-35032 Marburg, Germany

George Haller
Department of Mechanical and Process Engineering
ETH Zürich
CH-8092 Zürich, Switzerland