Heavy fermions in transition metals and transition-metal oxides H.-A. Krug von Nidda, R. Bulla, N. Büttgen, M. Heinrich and A. Loidl Eur. Phys. J. B, 34 4 (2003) 399-407 Published online: 09 September 2003 DOI: 10.1140/epjb/e2003-00237-9