CURRENT RESEARCH INTO MIXED-MU LEVITATOR DESIGNS FOR HIGH SPEED MAGLEV VEHICLES G.M. Asher, J.T. Williams, R.J.A. Paul et J. Brown J. Phys. Colloques, 45 C1 (1984) C1-733-C1-738 DOI: 10.1051/jphyscol:19841150