Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe6 and Fe8 A. Honecker, F. Meier, D. Loss and B. Normand Eur. Phys. J. B, 27 4 (2002) 487-495 Published online: 25 June 2002 DOI: 10.1140/epjb/e2002-00182-1