Liquid metal flows driven by rotating and traveling magnetic fields J. Stiller, K. Koal, W.E. Nagel, J. Pal and A. Cramer Eur. Phys. J. Special Topics, 220 (2013) 111-122 Published online: 26 March 2013 DOI: 10.1140/epjst/e2013-01801-8