Unconventional isotope effects in superconducting fullerides M. Riccò, F. Gianferrari, D. Pontiroli, M. Belli, C. Bucci and T. Shiroka EPL, 81 5 (2008) 57002 Published online: 31 January 2008 DOI: 10.1209/0295-5075/81/57002